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(|(a−1)tan(x2)−√a2−1|)−ln(|(a−1)tan(x2)+√a2−1|)a√a2−1
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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