integration of $\frac{1}{\sqrt{\sin(x-a)\sin(x-b)}}$

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What is the solution? $$\int\frac{1}{\sqrt{\sin(x-a)\sin(x-b)}}dx$$ I have already tried to solve this integration. But I failed.

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For first, get rid of one parameter. The problem is clearly equivalent to finding: $$ \int\frac{dx}{\sqrt{\sin(x)\sin(x+2c)}}=\sqrt{2}\int\frac{dx}{\sqrt{\cos(2c)-\cos(2x+2c)}} $$ or: $$ \int \frac{dx}{\sqrt{K-\cos x}}=-\int\frac{dy}{\sqrt{(K-y)(1-y^2)}} $$ that is an elliptic integral.