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部分積分法を利用して e^x*cosx dx =∫cosx d(e^x) =e^xcosx-e^x d(cosx) =e^xcosx+e^x*sinx dx =e^xcosx+sinx d(e^x) =e^xcosx+e^xsinx-e^x d(sinx) =e^xcosx+e^xsinx-e^x*cosx dx したがってには、 e^x*cosx dx=[e^xcosx+e^xsinx]/2+C 何があった?
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