Ok, I have encountered this one a few hours ago:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\int \frac{cos x}{\sqrt{a - b cos x}}dx [/tex]

I have tried all techniques I know, integration by part, half-angle formula, substitution, trigo approach, and so on, but it seems, I could not integrate this one. I am no noob in integration, but this one is a bit difficult. How do I integrate it?

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# Impossible Integration involving cosx/sqrt(a-bcosx)

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