## anonymous one year ago I need some guidance...

1. anonymous

|dw:1439211637631:dw|

2. anonymous

on what?

3. anonymous

What method should I use on this.

4. anonymous

is it like this?$x *\cos( \frac{ x }{ 2}) *dx$

5. anonymous

yes

6. anonymous

ok what do you need to find. just simplify?

7. anonymous

sorry I am n

8. anonymous

So I thought it would go like this |dw:1439211902444:dw| but its wrong.

9. Loser66

Apply integral by part with let u = x dv = cos (x/2) dx du = dx v = 2 sin (x/2)

10. Loser66

You can handle it from here, right?

11. anonymous

THanks, I got the right answer now.