- #1
jdawg
- 367
- 2
Homework Statement
∫cosx(lnsinx)dx
Homework Equations
The Attempt at a Solution
u=lnsinx dv=cosxdx
du=cosx/sinx dx v=sinx
=(lnsinx)(sinx)-∫(sinx)(cosx/sinx)dx
=(lnsinx)(sinx)-(sinx)+C
I thought that I did this correctly, but my teacher said that u should equal sinx. Why would u not equal lnsinx?