计算定积分∫0xx 1n(sinx)dx

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问题 计算定积分∫0xx 1n(sinx)dx

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答案0πx1n(sinx)dx=π/2∫0π1n(sinx)dx=π∫0π/21n(sinx)dx, 由I=∫0π/21n(sinx)dx=∫0π/21n(cosx)dx得 2I=∫0π/21n(sinx)dx+∫0π/21n(cosx)dx=∫0π/21n1/2sin2xdx =-π/21n2+1/2∫0π/21nsin2xd(2x)= -π/21n2+1/2∫0π1nsinxdx =-π/21n2+∫0π/21nsinxdx=-π/21n2+I得I=-π/21n2, 固∫0xx1n(sinx)dx=[*]

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