Wednesday, July 31, 2019

calculus - How to Integrate intp0iln(1+alphacos(x)),mathrmdx

I've been trying to learn how to integrate by differentiation under the integral. I've made good progress on some problems, but I seem to not be able to get an answer for f(α)=π0ln(1+αcos(x))dx



I've managed to get as far as f(α)=π0cos(x)1+αcos(x)dx




But this seems like a ridiculous integral to try and integrate by elementary methods, indeed an integral calculator returns xa+ln(|(a1)tan(x2)a21|)ln(|(a1)tan(x2)+a21|)aa21



Hopefully someone can advise on whether I've already made a mistake in my working, or whether I've just completely misunderstood the method.

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