Evaluate the following integral:`int_0^pi(xtanx)/(secx\ cos e c\ x)dx`

Explanation

`int_0^pi(xtanx)/(secx\ cos e c\ x)dx`

`=int_0^pi x sn^2x dx ---(1)`

`I=int_0^pi(pi-x)sin^2(pi-x)dx`

`2I=int_0^pi pi sin^2 dx`

`I=pi/2 int_)^pi sin^2x dx`

`=(pi^)/4-pi/8 (sin 2 pi-0)`

`=(pi)^2/4`