sin 2x dx
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¡Òsin2xdx=
¡Òsin2xdx=1/2¡Òsin2xd2x=-1/2*cos2x+C
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sin2xµÄ»ý·ÖÊÇ:¡Òxsin2xdx=(-1/2)¡Òxdcos2x=(-1/2)(xcos2x-¡Òcos2xdx)=(-1/2)(xcos2x-(1/2)sin2x)+C=(1/4)sin2x-(1/2)xcos2x+C¡£ »ý·ÖÊÇ΢»ý·ÖѧÓëÊýѧ...
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sin2xdx=1/2sin2xd(2x)=-1/2cos2x + C
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