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=lim {f(a+3h)--f(a)+f(a)--f(a--h)}/2h =lim 3/2*[f(a+3h)--f(a)]/(3h)+lim 1/2*[f(a--h)--f(a)/(--h)] =3/2*f'(a)+1/2*f'(a) =2f'(a)
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