∫0πx|sinxcosx|/(1+sin4x)dx.

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问题0πx|sinxcosx|/(1+sin4x)dx.

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答案0πx|sinxcosx|/(1+sin4x)dx=π/2∫0π|sinxcosx|/(1+sin4x)=π∫0π/2sinxcosx/(1+sin4x)dx=π/2∫0π/2d(sin2x)/(1+sin4x)=π/2arctansin2x|0π/22/8.

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