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// example : 5.11
// solve the definite integral by 1) trapezoidal rule, 2)simpsons rule
// exact value of the integral is ln 2= 0.693147,
deff('[y]=F(x)','y=1/(1+x)')
//1)trapezoidal rule,
a=0;
b=1;
I =trapezoidal(0,1,F)
disp(error =.75-.693147)
// simpson's rule
I=simpson(a,b,F)
disp(error =.694444-.693147)
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