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(f(x0+h)-f(x0-h))/2h=(f(x0+h)-f(x0)+f(x0)-f(x0-h))/2h=1/2 *(((fx0+h)-f(x0))/h +((fx0-h)-f(x0))/(-h))=1/2(f'(x0)+ f'(x0))= f'(x0)
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