计算定积分∫0π/2e-xcosxdx.

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问题 计算定积分∫0π/2e-xcosxdx.

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答案由于∫0π/2e-xcosxdx=e-xsinx|0π/2+∫0π/2sinxdx =e-π/2+(-e-xcosx|0π/2-∫0π/2e-xcosxdx) =e-π/2+1-∫0π/2cosxdx, 2∫0π/2e-xcosxdx=e-π/2+1, ∫0π/2e-xcosxdx=1/2(e-π/2+1).

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