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int2xcos3xcos2xdx...

`int2xcos3xcos2xdx`

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`int2xcos3xcos2xdx`
=`intx[cos5x+cosx]dx`
=`intx.cos5xdx+intx.cosxdx`
=`x.(sin5x)/5-int1.(sin5x)/5dx+x.sinx-int1.sinxdx`
1/5.xsin5x+1/25cos5x+xsinx+cosx+C
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