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.
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There is a reduction formula for this. It is the same as $\displaystyle \int csc^{4}(x)dx$ Try using: $\displaystyle \int csc^{n}(x)dx=\frac{-1}{n-1}csc^{n-2}(x)cot(x)+\frac{n-2}{n-1}\int csc^{n-2}(x)dx$ Just use n=4 for your integral.
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