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int2xsin2xcosxdx...

`int2xsin2xcosxdx`

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`int2xsin2xcosxdx`
=`intx(sin3x+sinx)dx`
=`intx.sin3xdx+intxsinxdx`
=`x.(-(cos3x)/3)-int1.(-(cos3x)/3)dx+x.(-cosx)-int1.(-cosx)dx`
=-1/3xcos3x+1/9sin3x-xcosx+sinx+C
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