â«xe^x dx,
=â«xde^x
=xe^x-â«e^xdx
=xe^x-e^x+c
â«e^xcos2xdx
=(1/2)â«e^xdsin2x
=(1/2)e^xsin2x-(1/2)â«sin2xe^xdx
=(1/2)e^xsin2x+(1/4)â«e^xdcos2x
=(1/2)e^xsin2x+(1/4)e^xcos2x-(1/4)â«cos2xe^xdx
æ以ï¼
æ¬é¢=ï¼2/5ï¼e^xsin2x+(1/5)e^xcos2x+c.
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â«e^2e^dx
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