# Thread: Reduction Method

1. ## Reduction Method

Hi

How would I do this question:

2. Originally Posted by xwrathbringerx
Hi

How would I do this question:
http://www.wolframalpha.com/input/?i=integral[%28Sin[Pi%2F4+-+3x]%29^4]

Click on "Show Steps"

3. Could someone please please show me where I got it wrong in my working out????

4. simplify by letting t = pi/4 - 3theta -1/3 dt = dtheta

then apply reduction formula

5. is the reduction formula in my working out actually right?