# Math Help - integral

1. ## integral

do any1 knows a simple method to integrate $sin^ 8x dx$ obviously without expanding..........

2. The usual method (for an even power) is to make repeated use of the formulae

$\sin^2A = \frac{1}{2}(1-\cos2A),$ $\cos^2A = \frac{1}{2}(1+\cos2A)$

to reduce the power(s) down to 1.