设f’(x)=arcsin(x-1)2且f(0)=0,求I=∫01f(x)dx

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问题 设f’(x)=arcsin(x-1)2且f(0)=0,求I=∫01f(x)dx

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答案由f(0)=0得f(x)=∫0xarcsin(t-1)2dt,则 ∫01f(x)dx=xf(x)|01-∫01xarcsin(x-1)2dx =f(1)-∫01[(x-1)+1]arcsin(x-1)2dx =f(1)-1/2∫01arcsin(x-1)2d(x-1)2-∫01arcsin(x-1)2dx =-1/2∫01arcsin(x-1)2d(x-1)2=-1/2∫10arcsinxdx=1/2∫01arcsinxdx [*]

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