# Math Help - integration pb.

1. ## integration pb.

I cannnot integrate dx/sin(x)^4 .

I guess there should be some transformation as starting point but i cannot really see so far which way to go. Tryed many different variations.
thx.

2. There is a reduction formula for this. It is the same as

$\int csc^{4}(x)dx$

Try using: $\int csc^{n}(x)dx=\frac{-1}{n-1}csc^{n-2}(x)cot(x)+\frac{n-2}{n-1}\int csc^{n-2}(x)dx$

Just use n=4 for your integral.