`intsin^3xdx`

Explanation

`intsin^3xdx=intsin^2x.sinxdx`
=`int(1-cos^2x)sinxdx`
[Put cox=t
Then sinxdx=-dt]
=`int(1-t^2).(-dt)=1/3t^3-t+C`
`1/3cos^3x-cosx+C`