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}}{PARA 18 "" 0 "" {TEXT 337 9 "S olutions" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{SECT 0 {PARA 3 "" 0 "" {TEXT -1 62 "Exercise 1 Checking that a Differential Equation is Sati sfied" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 " " }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 270 18 " \+ " }}{PARA 0 "" 0 "" {TEXT -1 13 " " }{TEXT 329 8 " " }{XPPEDIT 330 1 "y(x)=A*exp(-1/sqrt(x))*(x^(3/4)+x^(5 /4))+B*exp(1/sqrt(x))*(x^(3/4)-x^(5/4))" "/-%\"yG6#%\"xG,&*(%\"AG\"\" \"-%$expG6#,$*&F*F*-%%sqrtG6#F&!\"\"F3F*,&)F&*&\"\"$F*\"\"%F3F*)F&*&\" \"&F*F8F3F*F*F**(%\"BGF*-F,6#*&F*F*-F16#F&F3F*,&)F&*&F7F*F8F3F*)F&*&F; F*F8F3F3F*F*" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 328 7 " " }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 42 "is a solution of the differential equation" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 24 " \007 " }{TEXT 326 14 " \+ " }{XPPEDIT 327 1 "diff( y(x), x,x) = (4+5*x)*y(x)/(16*x^3)" "/-%%dif fG6%-%\"yG6#%\"xGF)F)*(,&\"\"%\"\"\"*&\"\"&F-F)F-F-F--F'6#F)F-*&\"#;F- *$F)\"\"$F-!\"\"" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 179 "Do this by replacing the question marks in the next two execut ion groups with appropriate arguments. Execute each group by placing t he cursor within it and pressing the Enter key." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 127 "subs( y(x) = A*exp(-1/sqrt(x))*(x^(3/4)+x^(5/4))+ B*exp(1/sqrt(x))*(x^(3/4)-x^(5/4)) , diff(y(x),x,x) = (4+5*x)*y(x)/(16 *x^3) );" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#/-%%diffG6$-F%6$,&*(%\"AG \"\"\"-%$expG6#,$*$%\"xG#!\"\"\"\"#F4F,,&*$F2#\"\"$\"\"%F,*$F2#\"\"&F: F,F,F,*(%\"BGF,-F.6#F1F,,&F7F,F;F4F,F,F2F2,$*(,&F:F,F2F=F,F)F,F2!\"$#F ,\"#;" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 86 "simplify( lhs(\")- rhs(\") ); # Replace the doublequotes \" with % in Releases 5 and u p" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#\"\"!" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 14 "Note: If " }{TEXT 331 33 "eqn := expression1 = expression2" } {TEXT -1 34 " then sometimes simplifying " }{TEXT 332 22 " lhs(e qn) - rhs(eqn) " }{TEXT -1 63 " (to see if 0 results) is more po werful than simplifying " }{TEXT 333 4 " eqn" }{TEXT -1 10 " itself ." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{SECT 0 {PARA 259 "" 0 "" {TEXT -1 45 "Exercise 2 Trajectories and Direction Fields" }}{PARA 0 "" 0 " " {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 278 18 "Backgroud Reading:" } {TEXT -1 58 " Worksheet: for background on direction field plots \+ " }{HYPERLNK 17 "dfieldplotR4.mws" 1 "dfieldplotR4.mws" "" }}{PARA 0 "" 0 "" {TEXT -1 106 " \+ for background on working with functions " } {HYPERLNK 17 "Tutor1R4.mws" 1 "Tutor1R4.mws" "" }{TEXT -1 93 " \+ \nThe \+ help pages for " }{HYPERLNK 17 "dfieldplot" 2 "DEtools[dfieldplot]" " " }{TEXT -1 8 " and " }{HYPERLNK 17 "display" 2 "plots[display]" " " }{TEXT -1 1 "." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 270 "" 0 "" {TEXT -1 142 "If a 1000 kg bomb is s ubject only to the force of the Earth's gravity and a linear drag law, then the differential equation for its velocity " }{TEXT 272 1 "v" } {TEXT 273 1 " " }{TEXT -1 14 " (measured in " }{TEXT 271 3 "m/s" } {TEXT -1 25 ") is\n\n " }{TEXT 313 12 " \+ " }{XPPEDIT 314 1 "diff(v(t),t) = -g-.015*v(t)" "/-%%diffG6$-%\"vG6#% \"tGF),&%\"gG!\"\"*&$\"#:!\"$\"\"\"-F'6#F)F1F," }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 2 " " }}{PARA 0 "" 0 "" {TEXT -1 8 "Here " }{TEXT 275 1 "g" }{TEXT 277 1 " " }{TEXT 276 6 " = 9.81" }{TEXT 274 87 " m/s/s. (The coefficient 0.015 depends on vario us factors which are not relevant here.)" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{SECT 0 {PARA 4 "" 0 "" {TEXT -1 23 "a) Direction Field Plot" }}{PARA 0 "" 0 "" {TEXT -1 71 "Plot th e direction field of this differential equation in the window " } {TEXT 269 26 "[ 0 , 180 ] x [ -600 , 0 ]" }{TEXT -1 1 "." }}{PARA 0 " " 0 "" {TEXT -1 122 "Do this by replacing the question marks with appr opriate arguments. For the last execution group, look up the availabl e " }{HYPERLNK 17 "color choices" 2 "color" "" }{TEXT -1 105 " and p ick one you like. (Light colors do not alwayys print out well.) 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Use the ditto oper ator on the right side of the assignment" }}{PARA 0 "" 0 "" {TEXT -1 1 " " }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 60 "fieldPlot := \" : # Use % instead of \" for releases 5 and up" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{SECT 0 {PARA 4 "" 0 "" {TEXT -1 53 "b) Plotting the Soluti on of One Initial Value Problem" }}{PARA 0 "" 0 "" {TEXT -1 15 "If the bomb is " }{TEXT 315 7 "dropped" }{TEXT -1 1 " " }{TEXT 257 1 "," } {TEXT -1 32 " find an explicit formula for " }{TEXT 263 4 "v(t)" } {TEXT -1 5 ". \n" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 37 "dsolve ( \{ ode , v(0)=0 \} , v(t) ); " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#/ -%\"vG6#%\"tG,&$!$a'\"\"!\"\"\"-%$expG6#,$F'$!+++++:!#6$\"$a'F+" }}} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 45 "Define th e solution of this equation to be " }{TEXT 319 2 "v1" }{TEXT -1 1 ": " }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 74 "v1 := unapply( rhs( \" ) , t ); # Use % instead of \" for releases 5 and up" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#v1G:6#%\"tG6\"6$%)operatorG%&arrowGF(,&$!$a'\"\"!\" \"\"-%$expG6#,$9$$!+++++:!#6$\"$a'F/F(F(" }}}{PARA 0 "" 0 "" {TEXT -1 9 "\nPlot " }{TEXT 318 5 "v1(t)" }{TEXT -1 8 " for " }{TEXT 317 1 "t" }{TEXT -1 20 " in the interval " }{TEXT 316 10 "[ 0 , 180]" } {TEXT -1 25 ". Use the plot option " }{TEXT 320 13 "thickness = 2" }{TEXT -1 9 ". (See " }{HYPERLNK 17 "plot,options" 2 "plot,options" "" }{TEXT -1 4 ". )\n" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 58 "plo t(v1(t), t = 0 .. 180 , thickness = 2, color = coral );" }}{PARA 13 " " 1 "" {INLPLOT "6'-%'CURVESG6#7S7$\"\"!F(7$$\"1+++]x[BR!#:$!1q'f^Zryt $!#97$$\"1++]iMHPtF,$!1y@Piw#f\"oF/7$$\"1++]-vk<6F/$!1.\"*GpYV45!#87$$ \"1++]<06/:F/$!1K6v()G#4K\"F:7$$\"1++DTnt))=F/$!1c*3]b5Nh\"F:7$$\"1++D '[M`C#F/$!1y%)[3J5q=F:7$$\"1++D'zqXh#F/$!1*zR.H:<7#F:7$$\"1++D;bV'*HF/ $!1E%H0m\"onBF:7$$\"1++D\"fvqP$F/$!1,wK<7B*f#F:7$$\"1+++&p5'oPF/$!1Ek: (R3S#GF:7$$\"1++]F]Z8TF/$!1rK#*f![8,$F:7$$\"1+++&e5<]%F/$!1g^!oIr4@$F: 7$$\"1+++v-a\"*[F/$!1IZEhB0+MF:7$$\"1,++:M@n_F/$!1r$=JX)4sNF:7$$\"1++D ;1O3cF/$!1Nq_X<:?PF:7$$\"1+++Nw,9gF/$!130&HT>m)QF:7$$\"1+++SBmdjF/$!1H LKQr#*>SF:7$$\"1***\\i#GSdnF/$!1ed$)oBfmTF:7$$\"1*******)3C6rF/$!1udv[ !y#*G%F:7$$\"1++DEtX*\\(F/$!1np\\B+g;WF:7$$\"1++vy68pyF/$!19:'e\")R6`% F:7$$\"1,+]iq%[D)F/$!1=OE>)oSk%F:7$$\"1,+D^Y04')F/$!1+hmUD@]F:7$$\"1++DCSl55F:$!1*>1S1kQ5&F:7$$\"1+++8)*>\\5F:$! 1l%R[lWX=&F:7$$\"1++DZ$4p3\"F:$!1Kv<\\p3f_F:7$$\"1+]ig_RB6F:$!15j^ogIF `F:7$$\"1++vYm!R;\"F:$!12L3*e.))R&F:7$$\"1+++HzI+7F:$!1%*=)y[W%faF:7$$ \"1++]nSQDcn&F:7$$\"1+]7xK*pQ\"F:$ !1ufl'fcLs&F:7$$\"1++](H4,]\"F:$!1#)f/l>!3&eF:7$$\"1++v:dGQ:F:$!1U,^x*f\"* )eF:7$$\"1+]i;h9w:F:$!1WP7F;4DfF:7$$\"1+++$*e$4h\"F:$!1g0?>vNcfF:7$$\" 1++v-*33l\"F:$!1h#4.]T-*fF:7$$\"1+++)zrko\"F:$!1\"=!)Rqx)=gF:7$$\"1+]i #)e\\CR2'F:7$$\"$!=F($!1 O?oYfZ+hF:-%'COLOURG6&%$RGBG$\"*++++\"!\")$\")AR!)\\F\\[lF(-%+AXESLABE LSG6$%\"tG%!G-%*THICKNESSG6#\"\"#-%%VIEWG6$;F(Fbz%(DEFAULTG" 2 372 372 372 2 0 1 2 2 6 0 4 2 1.000000 45.000000 45.000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 150 3120 0 0 0 0 0 0 }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 65 "Before continuing, name t he plot structure that you just created." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 62 "droppedPlot := \" : \+ # Use % instead of \" for releases 5 and up" }}}{PARA 0 "" 0 "" {TEXT -1 1 " " }}}{SECT 0 {PARA 4 "" 0 "" {TEXT -1 58 "c) Plotting the Solut ion of a Second Initial Value Problem" }}{PARA 0 "" 0 "" {TEXT -1 57 " If a missile is propelled downwards with initial speed " }{TEXT 259 3 "100" }{TEXT 279 1 " " }{TEXT 258 6 "m/s, " }{TEXT -1 30 "find an e xplicit formula for " }{TEXT 264 4 "v(t)" }{TEXT -1 3 ". " }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 41 " dsolve( \{ ode , v(0) = -100 \} , \+ v(t) );" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#/-%\"vG6#%\"tG,&$!$a'\"\"! \"\"\"-%$expG6#,$F'$!+++++:!#6$\"$a&F+" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 45 "Defi ne the solution of this equation to be " }{TEXT 323 2 "v2" }{TEXT -1 1 ":" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 72 "v2 := unapply( rhs(\") \+ , t ); # Use % instead of \" for releases 5 and up" }}{PARA 11 "" 1 " " {XPPMATH 20 "6#>%#v2G:6#%\"tG6\"6$%)operatorG%&arrowGF(,&$!$a'\"\"! \"\"\"-%$expG6#,$9$$!+++++:!#6$\"$a&F/F(F(" }}}{PARA 0 "" 0 "" {TEXT -1 10 "\n\nPlot " }{TEXT 322 5 "v2(t)" }{TEXT -1 8 " for " } {TEXT 325 1 "t" }{TEXT -1 19 " in the interval " }{TEXT 321 11 "[ 0 \+ , 180 ]" }{TEXT -1 25 ". Use the plot option " }{TEXT 324 13 "thick ness = 2" }{TEXT -1 9 ". (See " }{HYPERLNK 17 "plot,options" 2 "plot ,options" "" }{TEXT -1 4 ". )\n" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 58 "plot(v2(t) , t = 0 .. 180 , thickness = 2, color = gold );" }} {PARA 13 "" 1 "" {INLPLOT "6'-%'CURVESG6#7S7$\"\"!$!$+\"F(7$$\"1+++]x[ BR!#:$!1S[U\\Jj;8!#87$$\"1++]iMHPtF.$!1;4$))ottd\"F17$$\"1++]-vk<6!#9$ !1-$H0'o3b=F17$$\"1++]<06/:F:$!1v2.6p%*=@F17$$\"1++DTnt))=F:$!19p'GS'z mBF17$$\"1++D'[M`C#F:$!19?&4iaTe#F17$$\"1++D'zqXh#F:$!1/F7#*RH(z#F17$$ \"1++D;bV'*HF:$!1*3'eD3l0IF17$$\"1++D\"fvqP$F:$!1p`P^_z,KF17$$\"1+++&p 5'oPF:$!1))>%=$G?#R$F17$$\"1++]F]Z8TF:$!1(pMiG(*3b$F17$$\"1+++&e5<]%F: $!1\\;(35(**>PF17$$\"1+++v-a\"*[F:$!1fT6zm;!)QF17$$\"1,++:M@n_F:$!1cT4 Hg!f-%F17$$\"1++D;1O3cF:$!1>vR.7K^TF17$$\"1+++Nw,9gF:$!1.P/*4NBH%F17$$ \"1+++SBmdjF:$!1:*p,Qf_S%F17$$\"1***\\i#GSdnF:$!1,sXM()\\HXF17$$\"1*** ****)3C6rF:$!1')>5O^ULYF17$$\"1++DEtX*\\(F:$!1Fn)*=*y7u%F17$$\"1++vy68 pyF:$!1D>j\")\\IQ[F17$$\"1,+]iq%[D)F:$!1p6K`l'R$\\F17$$\"1,+D^Y04')F:$ !1agR2(pq,&F17$$\"1++](Q:6**)F:$!1MN$*zO*=5&F17$$\"1++D;\"pzQ*F:$!1i[' \\9.]=&F17$$\"1***\\PXJMt*F:$!1RX&R(*HMD&F17$$\"1++DCSl55F1$!1x(pZrcMK &F17$$\"1+++8)*>\\5F1$!1cU#Q#3!=R&F17$$\"1++DZ$4p3\"F1$!1&GHQ@X\\X&F17 $$\"1+]ig_RB6F1$!1$>l^FLF^&F17$$\"1++vYm!R;\"F1$!1Yy8`%)HtbF17$$\"1+++ HzI+7F1$!1N;DVqmCcF17$$\"1++]nS&fq$4s&F17$$\"1++]'o&*GJ\"F1$!1o31n;!pw&F17$$\"1+]iAT7\\8F1$!1z*eZv#z 2eF17$$\"1+]7xK*pQ\"F1$!1@Sd=cA[eF17$$\"1++](H4,]\"F1$!1xrdFR=cfF17$$\"1++ v:dGQ:F1$!1B3_+on))fF17$$\"1+]i;h9w:F1$!1\")y59V6>gF17$$\"1+++$*e$4h\" F1$!1fF^[l-%+AXESLABELSG6$%\"tG%!G-%*THICKNESSG6#\"\"#-%%VIEWG6$ ;F(Fdz%(DEFAULTG" 2 372 372 372 2 0 1 2 2 6 0 4 2 1.000000 45.000000 45.000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 65 "Before continuing, name the plot structure that you just created." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 64 "pr opelledPlot := \" : # Use % instead of \" for releases 5 and up" }}} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{SECT 0 {PARA 4 "" 0 "" {TEXT -1 27 "d) Superimposing Everything" }}{PARA 0 " " 0 "" {TEXT -1 51 "Superimpose the plots that you obtained in parts \+ " }{TEXT 260 2 "a)" }{TEXT -1 2 ", " }{TEXT 261 2 "b)" }{TEXT -1 6 ", and " }{TEXT 262 2 "c)" }{TEXT -1 77 ". 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" }}{PARA 0 "" 0 "" {TEXT -1 59 " The help pages for " } {HYPERLNK 17 "dfieldplot" 2 "DEtools[dfieldplot]" "" }{TEXT -1 5 " , \+ " }{HYPERLNK 17 "display" 2 "plots[display]" "" }{TEXT -1 13 " , an d " }{HYPERLNK 17 "subs" 2 "subs" "" }{TEXT -1 2 " ." }}{PARA 0 " " 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 " " {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 21 "First, restart the " }{TEXT 295 5 "MAPLE" }{TEXT -1 22 " kernel and load the " }{TEXT 296 7 "DEtools" }{TEXT -1 68 " package. (Place the cursor anywhere in the \+ next line and press the " }{TEXT 297 5 "Enter" }{TEXT -1 6 " key.)" }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 25 "restart: with(DEtools):" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }} {PARA 0 "" 0 "" {TEXT -1 34 "Consider the differential equation" }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 37 "ode := diff(y(x), x) = sin(x - y(x));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%$odeG/-%%diffG6$-%\"yG6 #%\"xGF,,$-%$sinG6#,&F,!\"\"F)\"\"\"F2" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 110 "Don't forget to execute the precedi ng execution group (by placing the cursor anywhere within and pressing the " }{TEXT 298 5 "Enter" }{TEXT -1 6 " key.)" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{SECT 0 {PARA 4 "" 0 " " {TEXT -1 51 "a) Using the Direction Field Plot to Spot Solutions" }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 5 "Use " }{TEXT 300 10 "dfieldplot" }{TEXT -1 76 " to plot the direction field of the given equation in the viewing win dow " }{TEXT 301 21 "[-10, 10] x [-10, 10]" }{TEXT -1 4 " . 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The right hand side can therefore not depend on " }{TEXT 303 1 "x " }{TEXT -1 3 " . " }}{PARA 0 "" 0 "" {TEXT -1 36 "What can you conclu de the value of " }{TEXT 304 1 "m" }{TEXT -1 5 " is?" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 7 "m := 1; " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"mG\"\"\"" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 5 "Use " }{HYPERLNK 17 "solv e" 2 "solve" "" }{TEXT -1 7 " or " }{HYPERLNK 17 "fsolve" 2 "fsolve " "" }{TEXT -1 80 " (with the three parameters: equation, variable, r ange) to find the value of " }{TEXT 305 1 "b" }{TEXT -1 25 " that i s least negative." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 36 "fsolve( -arc sin(1) = b, b, -2 .. 0);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$!+Fjzq:! \"*" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 24 "solve( 1 = - sin(b), b);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#,$%#PiG#!\"\"\"\"#" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{SECT 0 {PARA 4 "" 0 "" {TEXT -1 23 "b) The General So lution" }}{PARA 0 "" 0 "" {TEXT -1 4 "Use " }{TEXT 306 5 "MAPLE" } {TEXT -1 59 " to find a general solution to the differential equatio n." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "dsolve(ode, y(x));" }}{PARA 11 "" 1 "" {XPPMATH 20 "6 #/,&*$,&!\"\"\"\"\"-%$tanG6#,&%\"xG#F(\"\"#-%\"yG6#F-#F'F/F(F'!\"#F-F' %$_C1G" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 20 "The solution that " }{TEXT 299 5 "MAPLE" }{TEXT -1 46 " returns might be implicit . If so then use " }{MPLTEXT 1 0 5 "solve" }{TEXT -1 16 " to solve for " }{MPLTEXT 1 0 4 "y(x)" }{TEXT -1 13 " explic itly." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 " " }}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 89 "eqn := y(x) = solve(\" , y(x)); # This line may be unnecessary with some Maple releases." }} {PARA 11 "" 1 "" {XPPMATH 20 "6#>%$eqnG/-%\"yG6#%\"xG,&F)\"\"\"-%'arct anG6#*&,(!\"#F+F)F+%$_C1GF+F+,&F)F+F2F+!\"\"F1" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 57 "One particular solution o f the differential equation is " }{MPLTEXT 1 0 15 "y(x) = x - Pi/2" } {TEXT -1 1 "." }}{PARA 0 "" 0 "" {TEXT -1 47 "There is no value of th e arbitrary constant " }{MPLTEXT 1 0 3 "_C1" }{TEXT -1 75 " that c orresponds to this solution (or any other straight line solution)." }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 47 "However, \+ plot the solutions that correspond to " }{MPLTEXT 1 0 8 "_C1 = 10" } {TEXT -1 8 " and " }{MPLTEXT 1 0 9 "_C1 = 100" }{TEXT -1 1 "." }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 46 "plot(subs(_C1 = 10, rhs(eqn) ), x = -10 .. 10);" }}{PARA 13 "" 1 "" {INLPLOT "6%-%'CURVESG6$7V7$$!+ m(F07$$!1*****pwnMa)F0$!1Y3 #R6<#HyF07$$!1+++#4m(G$)F0$!16%f:_&GSzF07$$!1*****p&[3:\")F0$!1\\P43[7 $*zF07$$!1+++@OS,zF0$!1!==Wp)H&*zF07$$!1+++jPH.xF0$!1*Q)zRgCgzF07$$!1+ ++/R=0vF0$!1'y@3Gxn*yF07$$!1+++P8#\\4(F0$!1@L2F0'*)p(F07$$!1+++/siqmF0 $!1\\E,h!4/V(F07$$!1+++(y$pZiF0$!1l*4aQ'[@rF07$$!1+++$yaE\"eF0$!1gxQ\" \\@ax'F07$$!1+++\">s%HaF0$!1Y:f4,7akF07$$!1+++]$*4)*\\F0$!16\"ok&=;zgF 07$$!1+++]_&\\c%F0$!11F10]@#p&F07$$!1+++]1aZTF0$!1]EG!Hl=J&F07$$!1+++/ #)[oPF0$!1ZL?FDah\\F07$$!1+++$=exJ$F0$!1)=u:R[,a%F07$$!1+++L2$f$HF0$!1 S;)QHd)zTF07$$!1+++PYx\"\\#F0$!1G())4?_wv$F07$$!1+++L7i)4#F0$!1a(GwPB; Q$F07$$!1+++P'psm\"F0$!1DE!*=&))p'HF07$$!1+++74_c7F0$!1I;&\\-d/d#F07$$ !1******zqZz#)!#;$!1qm;t\"=_:#F07$$!1++++s$QM%Fcs$!1$QD(*eSFx\"F07$$!1 ++++5zr)*!#=$!1:v*)QE6f8F07$$\"1++++!o2J%Fcs$!1tuog3W%G*Fcs7$$\"1++++% Q#\\\")Fcs$!1$4sf,>!GbFcs7$$\"1+++g\"*[H7F0$!1Ps!>LKTY\"Fcs7$$\"1++++d xd;F0$\"1`)f^))z3u#Fcs7$$\"1+++I0xw?F0$\"1o\"z3'4WgoFcs7$$\"1+++g&p@[# F0$\"1lY)o%z6&3\"F07$$\"1+++!3'HKHF0$\"1E:*fK@(G:F07$$\"1+++qZvOLF0$\" 1TLih>sF>F07$$\"1+++]2goPF0$\"1*)>R)e>TN#F07$$\"1++++u\"*fTF0$\"1dT^/i !3u#F07$$\"1+++])Hxe%F0$\"1v@,f-'Q;$F07$$\"1+++I!o-*\\F0$\"1_7)G]&=iNF 07$$\"1+++5k.6aF0$\"1X`M&\\+)yRF07$$\"1+++?WTAeF0$\"11'>&=ZM'Q%F07$$\" 1+++g!*3`iF0$\"1)G3nLEK\"[F07$$\"1+++I*zym'F0$\"1m\"*)GQgXA&F07$$\"1++ +5N1#4(F0$\"1ELlQCRXcF07$$\"1+++IYt7vF0$\"1%H_d?4H1'F07$$\"1++++xG**yF 0$\"1#[_6r,nW'F07$$\"1******R6KU$)F0$\"1nhOn?s')oF07$$\"1+++IbdQ()F0$ \"19(oYh3/G(F07$$\"1+++g`1h\"*F0$\"1W2%fj$G+xF07$$\"1,++S?Wl&*F0$\"1#R IeuoA5)F07$$\"#5\"\"!$\"1')pU'zpV`)F0-%'COLOURG6&%$RGBG$Ff[l!\"\"Fg[lF g[l-%+AXESLABELSG6$%\"xG%!G-%%VIEWG6$;$!#5Fg[lFe[l%(DEFAULTG" 2 372 372 372 2 0 1 0 2 9 0 4 2 1.000000 45.000000 45.000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 150 5104 0 0 0 0 0 0 }}}{EXCHG {PARA 0 " > " 0 "" {MPLTEXT 1 0 47 "plot(subs(_C1 = 100, rhs(eqn)), x = -10 .. 1 0);" }}{PARA 13 "" 1 "" {INLPLOT "6%-%'CURVESG6$7S7$$!#5\"\"!$!1(*yAOD $[:\"!#97$$!1nmm;p0k&*!#:$!1$4R,=\\76\"F-7$$!1LL$37a!*F17$$!1,+]P8#\\4( F1$!1zB+Sp&Rk)F17$$!1mm;/siqmF1$!1^P%*)zi(>#)F17$$!1****\\(y$pZiF1$!1Z 6bV\"Gpz(F17$$!1LLL$yaE\"eF1$!13WG#z*)>O(F17$$!1mmm\">s%HaF1$!1+lf!3&* )ypF17$$!1******\\$*4)*\\F1$!15Cz8.iZlF17$$!1+++]_&\\c%F1$!1Um$**ytX6' F17$$!1+++]1aZTF1$!1G%=&zBD(p&F17$$!1mm;/#)[oPF1$!1\">r5&QG=`F17$$!1LL L$=exJ$F1$!1=6&3v_w'[F17$$!1LLLL2$f$HF1$!1(Q2MP3f[%F17$$!1++]PYx\"\\#F 1$!1dBu$3[=/%F17$$!1MLLL7i)4#F1$!1'yi:vy([OF17$$!1****\\P'psm\"F1$!14) RZh=v@$F17$$!1****\\74_c7F1$!1wK5Ii&o!GF17$$!1:LL$3x%z#)!#;$!12(GHMs$y BF17$$!1ILL3s$QM%Fer$!1!fUAp*)[)>F17$$!1^omm;zr)*!#=$!1z(\\3xk/c\"F17$ $\"1WLLezw5VFer$!12UStdg>6F17$$\"1.++v$Q#\\\")Fer$!1Ycqd2OetFer7$$\"1N LLe\"*[H7F1$!1uV$\\!3J*Fer7$$\"1+++vgHKHF1$ \"1Ac`&)*>6Q\"F17$$\"1lmmmZvOLF1$\"1$))*RQ6]&y\"F17$$\"1,++]2goPF1$\"1 g[;1]E " 0 "" {MPLTEXT 1 0 60 "y(x) = limit(x-2*arctan((-2+ x+_C1)/(x+_C1)),_C1 = infinity);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#/- %\"yG6#%\"xG,&F'\"\"\"%#PiG#!\"\"\"\"#" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}}{PARA 0 "" 0 "" {TEXT -1 0 "" }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}} {SECT 0 {PARA 3 "" 0 "" {TEXT -1 17 "Exercise 4 The " }{TEXT 294 5 " MAPLE" }{TEXT -1 12 " Function " }{TEXT 293 6 "DEplot" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 312 18 "Backgroud Reading: " }{TEXT -1 21 " The help page for " }{HYPERLNK 17 "DEplot" 2 "DEtoo ls[DEplot]" "" }{TEXT -1 105 " is rather involved. The next execution group provides you with an example of how to use the function. " }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 335 7 "Caveat:" }{TEXT -1 3 " " }{TEXT 334 6 "DEplot" }{TEXT -1 3 " " }{TEXT 336 237 "uses a default number of steps. If you use too great an interval then the resulting step size may be too large. If your plot suggests \+ that this is happening, then go to the linked help page for DEplot to \+ see how to adjust the step size." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }} {PARA 0 "" 0 "" {TEXT -1 69 "Look at the commands in the next executio n group to see how we use " }{HYPERLNK 17 "DEplot" 2 "DEplot" "" } {TEXT -1 50 " to plot a solution to the Initial Value Problem" }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 2 "\022 " }} {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT 266 4 " " } {TEXT 280 44 " y'(x) = sin(x^2/(1+x^2)+y(x)), y(-5) = 6:" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 " " {TEXT -1 54 "PLease read and then execute the next execution group. 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