设f(x)=∫0xecostdt,求∫0πf(x)cosxdx.

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问题 设f(x)=∫0xecostdt,求∫0πf(x)cosxdx.

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答案e-1-e

解析0πf(x)cosxdx=∫0πf(x)d(sinx)=f(x)sinx|0π-∫0πf′(x)sinxdx
=-∫0πecosxsinxdx=cosx|0π=e-1-e.
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