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Integrate the function xsin3x...

Integrate the function `xsin3x`

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Given `int (xsin3x)`
=`x int(sin3x)dx-int(d/dx *int sin3xdx)dx`
=`[x(-cos(3x))]/3-int[1(-cos3x)]/3 *dx`
=`[-xcos(3x)]/3+int(cos3x)/3*dx`
=`[x(-cos(3x))]/3+[sin3x]/[3.3]+c`
=`[x(-cos(3x))]/3+1/9*sin3x+c`
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