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- function I=trapez(a,b,c)
- a=0;
- b=1;
- h=(b-a)/2
- f=@(x) 2./(1+x.^2);
- fp2=@(x) 16*x.^2/((x.^2+1).^3)-4/((x.^2+1).^2);
- r=feval(fp2,c)./(12).*(b-a).^3
- I=h*(f(a)+f(b))-r
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