求定积分∫xcos2xdx∫xcos2xdx因为不太懂

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求定积分∫xcos2xdx∫xcos2xdx因为不太懂求定积分∫xcos2xdx∫xcos2xdx因为不太懂求定积分∫xcos2xdx∫xcos2xdx因为不太懂原式=1/2∫xcos2xd2x=1/

求定积分∫xcos2xdx∫xcos2xdx因为不太懂
求定积分∫xcos2xdx
∫xcos2xdx
因为不太懂

求定积分∫xcos2xdx∫xcos2xdx因为不太懂
原式=1/2∫xcos2xd2x
=1/2∫xdsin2x
分部积分
=1/2*xsin2x-1/2∫sin2xdx
=1/2*xsin2x-1/4∫sin2xd2x
=1/2*xsin2x+1/4*cos2x+C