File: derivative_example.pcm

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clear
window 0
defaults
pi=acos(-1)
generate x 0,,2*pi 100
y = cos(x)^3+sin(x)^3
graph x y
!
set curvecolor red
graph\overlay x deriv(x,y)
set curvecolor black
replot
set
 %xtextlocation 67
 %ytextlocation 72
 textalign 3
 textinteractive 0
 textcolor red
 
text 'df(x)/dx'
set
 %xtextlocation 40
 %ytextlocation 30
 textalign 1
 textcolor black
 
text 'f(x) = cos(x)<^>3<_> + sin(x)<^>3<_>'