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I am trying to compute the integral $$\int_{x_0}^{1}\frac{x^N\log(1+x)}{\sqrt{x^2+x_1^2}\sqrt{x^2+x_2^2}}\text{d}x$$ where $x_0, x_1$ and $x_2$ are related to some parameters $\kappa_\pm$ by $$x_0=\sqrt{\frac{\kappa_-}{\kappa_+}},x_1=\sqrt{\frac{1+\kappa_-}{1+\kappa_+}},x_2=\sqrt{\frac{1-\kappa_-}{1-\kappa_+}}$$ and $N$ is in $\{-1,0,1,2\}$. I expect the result to be some combination of logs and dilogs in the $x_i$ variables. However, I don't seem to be able to compute it. If the denominator was instead the square-root of a second-order polynomial, the integral would be computable with exactly the expected behaviour. However, in the present form it appears to be much harder.

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  • $\begingroup$ I really don’t expect this integral to be reducible to dilogs except in a few special cases. Do you have a good reason to expect this, or were you just hoping? =p $\endgroup$
    – David H
    Commented Mar 5 at 20:05

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