limx->0 [f(x)-f(0)]sin3x/x2 =4 则f'(0)等于几
1个回答
sin3x和3x是等价无穷小
f`(0)=limx->0[f(x)-f(0)]/x=limx->0[f(x)-f(0)]*3sin3x/(3x)x=4/3
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