计算∫0π/2sinx/(sinx+cosx)dx.

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问题 计算∫0π/2sinx/(sinx+cosx)dx.

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答案I=∫0π/2sinx/(sinx+cosx)dx→∫π/20cost/(cost+sint)(-dt)=∫0π/2cost/(cost+sint)dt=∫0π/2cosx/(cosx+sinx)dx,则2I=∫0π/2sinx/(sinx+cosx)dx+∫0π/2cosx/(cosx+sinx)dx-π/2,故∫0π/2sinx/(sinx+cosx)dx=π/4.

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