{VERSION 5 0 "SUN SPARC SOLARIS" "5.0" } {USTYLETAB {CSTYLE "Maple Input" -1 0 "Courier" 0 1 255 0 0 1 0 1 0 0 1 0 0 0 0 1 }{CSTYLE "2D Math" -1 2 "Times" 0 1 0 0 0 0 0 0 2 0 0 0 0 0 0 1 }{CSTYLE "2D Output" 2 20 "" 0 1 0 0 255 1 0 0 0 0 0 0 0 0 0 1 } {PSTYLE "Normal" -1 0 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 }0 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "Text Output" -1 2 1 {CSTYLE "" -1 -1 "Courier" 1 10 0 0 255 1 0 0 0 0 0 1 3 0 3 0 }1 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "Warning" 2 7 1 {CSTYLE "" -1 -1 " " 0 1 0 0 255 1 0 0 0 0 0 0 1 0 0 0 }0 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 } {PSTYLE "Maple Output" 0 11 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 }3 3 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }{PSTYLE "Maple Plot" 0 13 1 {CSTYLE "" -1 -1 "" 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 }3 0 0 -1 -1 -1 0 0 0 0 0 0 -1 0 }} {SECT 0 {EXCHG {PARA 0 "" 0 "" {TEXT -1 28 " **** MAPLE FILE # 4 ** **" }{TEXT -1 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 " " 0 "" {TEXT -1 85 "This file shows how to use MAPLE for implicit diff erentiation and higher derivatives." }}{PARA 0 "" 0 "" {TEXT -1 1 " " }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 35 "**** Implic it Differentiation ****" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 86 "Suppose we want to use implicit differentiation to c ompute the derivative dy/dx where " }}{PARA 0 "" 0 "" {TEXT -1 65 "y i s defined implicitly as a function of x through the equation\n " }}} {EXCHG {PARA 0 "" 0 "" {TEXT -1 68 " \+ x^2 + y^2 = 1" }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 21 "eqn := x^2 + y^2 = 1;" }}{PARA 11 " " 1 "" {XPPMATH 20 "6#>%$eqnG/,&*$)%\"xG\"\"#\"\"\"F+*$)%\"yGF*F+F+F+ " }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 88 "Notice that I've defined the \+ variable \"eqn\" to be the entire implicit equation, not just" }} {PARA 0 "" 0 "" {TEXT -1 19 "the left hand side." }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 84 "Conveniently, we \+ can carry out the entire implicit differentiation process using the" } }{PARA 0 "" 0 "" {TEXT -1 23 "\"implicitdiff\" command:" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 31 "dy_dx \+ := implicitdiff(eqn,y,x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%&dy_dxG ,$*&%\"xG\"\"\"%\"yG!\"\"F*" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 85 "No te the syntax: the first argument is the implicit equation (given by t he name eqn)." }}{PARA 0 "" 0 "" {TEXT -1 80 "the last two arguments t ell MAPLE that I am considering x to be the independent " }}{PARA 0 " " 0 "" {TEXT -1 71 "variable and y to be dependent on x. Thus MAPLE kn ows to compute dy/dx." }{MPLTEXT 1 0 1 " " }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 1 " " }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 75 "Now if we wanted to construct the tangent line to this circle at t he point " }}{PARA 0 "" 0 "" {TEXT -1 59 " \+ (1/sqrt(2), 1/sqrt(2))" }}{PARA 0 "" 0 "" {TEXT -1 27 "we can proceed as follows:\n" }}{PARA 0 "" 0 "" {TEXT -1 85 "1. Find the slo pe of the tangent line by evaluating dy/dx at the point in question: \n" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 33 "x0 := 1/sqrt(2); y0 : = 1/sqrt(2);" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}{PARA 0 "> " 0 " " {MPLTEXT 1 0 0 "" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#x0G,$*&\"\"#! \"\"F'#\"\"\"F'F*" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%#y0G,$*&\"\"#! \"\"F'#\"\"\"F'F*" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 29 "m := s ubs(\{x=x0,y=y0\},dy_dx);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"mG!\" \"" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 75 "Now we have calulated the s lope of the tangent line we seek by plugging the" }}{PARA 0 "" 0 "" {TEXT -1 52 "point of tangency into our expression for dy/dx....\n" } {MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 23 "ytan := y0 + m* (x-x0);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%%ytanG,&*$\"\"## \"\"\"F'F)%\"xG!\"\"" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 221 "Now we w ant to plot our original curve on the same set of axes with the tangen t\nline we just found. The regular plot command can't handle \nplottin g an implicit equation like x^2 + y^2 = 1. Instead we must use the com mand " }}{PARA 0 "" 0 "" {TEXT -1 83 "\"implicitplot.\" This is from a special set of plotting tools that you can access by" }}{PARA 0 "" 0 "" {TEXT -1 21 "issuing the command:\n" }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 12 "with(plots):" }}{PARA 7 "" 1 "" {TEXT -1 50 "Warning, the name changecoords has been redefined\n" }}} {EXCHG {PARA 0 "" 0 "" {TEXT -1 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 76 "You MUST include the plots package anytime you want to use the \+ implicitplot " }}{PARA 0 "" 0 "" {TEXT -1 46 "command, otherwise MAPLE won't understand it. 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1/n;" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 21 " \+ evalf((2^h - 1)/h)" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 3 "od;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"hG\"\"\"" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"\"\"\"\"!" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"hG#\"\"\"\" \"#" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"*CrUG)!\"*" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"hG#\"\"\"\"\"$" }}{PARA 11 "" 1 "" {XPPMATH 20 " 6#$\"*]Jwz(!\"*" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"hG#\"\"\"\"\"% " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"*g%Gov!\"*" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"hG#\"\"\"\"\"&" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$ \"*v<\\V(!\"*" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"hG#\"\"\"\"\"'" } }{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"*)GsZt!\"*" }}}{EXCHG {PARA 0 "> \+ " 0 "" {MPLTEXT 1 0 2 " " }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 82 " The same result can be accomplished using the repetition operator '$' as \+ follows:" }{MPLTEXT 1 0 1 " " }{TEXT -1 0 "" }}}{EXCHG {PARA 0 "" 0 " " {TEXT -1 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 18 "n := 'n'; h := 1/n;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"nGF$" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"hG*&\"\"\"F&%\"nG!\"\"" }}}{EXCHG {PARA 0 "> \+ " 0 "" {MPLTEXT 1 0 30 "evalf((2^h - 1)/h) $ n = 1..6;" }}{PARA 11 "" 1 "" {XPPMATH 20 "6($\"\"\"\"\"!$\"*CrUG)!\"*$\"*]Jwz(F($\"*g%GovF($\" *v<\\V(F($\"*)GsZtF(" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 81 "The $ tel ls MAPLE to execute the previous command for each integer n from 1 to \+ 6," }}{PARA 0 "" 0 "" {TEXT -1 42 "producing the same result as a \"do loop.\"\n" }{TEXT -1 0 "" }}{PARA 0 "" 0 "" {TEXT -1 59 "By the way, \+ the value of this limit, we now know, is ln(2):" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 9 "h := 'h';" } }{PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"hGF$" }}}{EXCHG {PARA 0 "> " 0 " " {MPLTEXT 1 0 23 "limit((2^h - 1)/h,h=0);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#-%#lnG6#\"\"#" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 9 "evalf(%);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#$\"+1=ZJp!#5" }}} {EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 82 "The $ operator can also be used to find higher derivative s. Suppose we've defined:" }}{PARA 0 "" 0 "" {TEXT -1 0 "" }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 12 "f := sin(x);" }} {PARA 11 "" 1 "" {XPPMATH 20 "6#>%\"fG-%$sinG6#%\"xG" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 20 "fprime := diff(f,x);" }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%'fprimeG-%$cosG6#%\"xG" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 55 " If we want to compute the 2nd derivative of f, we say:" }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 1 " " }{MPLTEXT 1 0 0 "" }}{PARA 0 "> " 0 "" {MPLTEXT 1 0 23 "f2prime := diff(f,x$2); " }}{PARA 11 "" 1 "" {XPPMATH 20 "6#>%(f2primeG,$-%$sinG6#%\"xG!\"\"" }}}{EXCHG {PARA 0 "" 0 "" {TEXT -1 74 "MAPLE also allows us to compile lists using the $ operator. 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