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{SECT 0 {PARA 208 "" 0 "" {TEXT 200 0 "" }{TEXT 200 0 "" }{TEXT 200 9 
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0 "" }}{PARA 0 "" 0 "" {TEXT 200 0 "" }}{EXCHG {PARA 0 "" 0 "" {TEXT 
217 11 "We'll need:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 12 "with
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"" 0 "" {TEXT 218 19 "Parametric surfaces" }}{EXCHG {PARA 0 "" 0 "" 
{TEXT 200 92 "Produce the 3D graphs of parametric surfaces is quite ea
sy in Maple. You need to specify the" }}{PARA 0 "" 0 "" {TEXT 200 77 "
functions x(u,v), y(u,v), z(u,v) and a range for the variables. For ex
ample: " }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 1 0 0 "" }}}{EXCHG 
{PARA 0 "> " 0 "" {MPLTEXT 1 0 59 "plot3d([sin(u),cos(u),v],v=0..1,u=0
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.5,-1.5..1.5,-.1..1.5]);" }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "" 0 ""
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xes=boxed);" }{MPLTEXT 1 0 0 "" }}}{EXCHG {PARA 0 "" 0 "" {TEXT 200 
96 "An animated plot can be used to show the role of the variables in \+
a parametric surface. Compare:" }}}{EXCHG {PARA 0 "> " 0 "" {MPLTEXT 
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