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f''(x)=(f'(x+h)-f'(x))/h = ((f(x+2h)-f(x+h))/h - (f(x+h)-f(x))/h)/h = (f(x+2h)-2f(x+h)+f(x))/h^2
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f''(x)=(f'(x+h)-f'(x))/h = ((f(x+2h)-f(x+h))/h - (f(x+h)-f(x))/h)/h = (f(x+2h)-2f(x+h)+f(x))/h^2