# Indefinite Integral

1. Apr 22, 2008

### RedBarchetta

1. The problem statement, all variables and given/known data
The integral of 5*(sin(6x)/sin(3x))dx

3. The attempt at a solution

I'm not quite sure what to do with this one. I moved 5 to the left of the integral, but then i'm lost. Apparently i'm rusty on these trig identities.

Could anyone help me get started? Thank you.

2. Apr 22, 2008

### jandl

Look up the double angle formula for sine, wikipedia is good. You should be able to simplify with the bottom some then.