Integration problem

1. Mar 7, 2013

Government\$

1. The problem statement, all variables and given/known data

Integrate $\int3^x\cos x\,dx$

3. The attempt at a solution

It has to be done using partial integration.

I don't know what should be u?

2. Mar 7, 2013

pongo38

What choices do you have?

3. Mar 7, 2013

vela

Staff Emeritus
You're just going to have to try stuff out and see how it works out.