Evaluate: `intxcosx\ dx`

Explanation

Given,`intxcosx\ dx`
Let `u=x`
`=>du=dx`
and `dv=cosxdx`
`=>v=sinx`

Integrating by parts, we get
`=xsinx−intsinxdx`
`=xsinx−(−cosx)+c`
`
=xsinx+cosx+c `
where `c` is the integration constant.