求不定积分∫cos(lnχ)dχ.

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问题 求不定积分∫cos(lnχ)dχ.

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答案I=∫cos(lnχ)dχ[*]∫etcostdt=∫et(sint) =etsint-∫etsintdt=etsint+∫etd(cost)=etsint+etcost-I, 则∫cos(lnχ)dχ=[*]et(sint+cost)+C=[*]sin(lnχ)+cos(lnχ)]+C.

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