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%ZHUEG" 1 2 5 0 10 1 2 4 1 3 2 1.0 60.0 105.0 1 0 "Curve 1" }}{TEXT 
217 0 "" }}}{EXCHG {PARA 204 "" 0 "" {TEXT 207 0 "" }}{PARA 213 "" 0 "
" {TEXT 221 96 "We can include in the analysis of this multivariable f
unction the study of their \"level curves\"." }{TEXT 221 0 "" }}{PARA 
213 "" 0 "" {TEXT 221 0 "" }}{PARA 214 "" 0 "" {TEXT 222 12 "Level Cur
ves" }{TEXT 223 0 "" }}{PARA 215 "" 0 "" {TEXT 224 170 "The level curv
es of a function of two variables are the curves where the function ta
kes a constant proected into the xy-plane. The level curves have equat
ions: f(x,y) = c" }{TEXT 224 0 "" }}{PARA 216 "" 0 "" {TEXT 225 125 "T
he following command allows to draw the level curves in the xy-plane i
n colors. Each color represent a different value of c." }{TEXT 226 0 "
" }}{PARA 204 "" 0 "" {TEXT 207 0 "" }}}{EXCHG {PARA 207 "> " 0 "" 
{MPLTEXT 1 212 12 "with(plots):" }{MPLTEXT 1 213 0 "" }}}{EXCHG {PARA 
207 "> " 0 "" {MPLTEXT 1 212 85 "contourplot3d(f2(x,y),x=-5..5,y=-5..5
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