已知函数f(x)=∫0x3tsintdtf(x)=\int_{0}^{x^3} t \sin t dtf(x)=∫0x3tsintdt,则f′(x)=f'(x) =f′(x)=( ).
(A)3x2cosx33x^2 \cos x^33x2cosx3
(B)x3sinx3x^3 \sin x^3x3sinx3
(C)−3x2sinx3-3x^2 \sin x^3−3x2sinx3
(D)3x2sinx33x^2 \sin x^33x2sinx3
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