求∫arctanex/exdx.

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问题 求∫arctanex/exdx.

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答案令ex=t,dx=1/tdt,∫arctanex/exdx=∫arctant/t2dt=-∫arctantd(1/t)=-arctant/t+∫1/t(1+t2)dt=-arctant/t+∫(1/t-t/(1+t2))dt=-arctant/t+lnt-1/2ln(1+t2)+C=-arctanex/ex+x-1/2ln(1+e2x)+C.

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