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int0^pisin^3xcosxdx...

`int_0^pisin^3xcosxdx`

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`int_0^pisin^3x.cosxdx`
[Put sinx=t, then cosxdx=dt
When x=0,t=0,when `x=pi`,t=0]
=`int_0^pit^3dt=0`
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