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Aug 5, 2022 at 22:21 comment added Peter Taylor Generalising a bit further we have $$\frac 1{\pi \csc {k \pi}} \int_0^\infty \frac{t^k}{(t+a)(t+b)} \textrm{d}t = \frac{a^k - b^k}{a - b}$$ and $$\frac 1{\pi \csc {k \pi}} \int_0^\infty \frac{t^k}{(t+a)(t+b)(t+c)} \textrm{d}t = \frac{a^k (b - c) + b^k (c - a) + c^k (a - b)}{(a - b)(b - c)(c - a)}$$ but I'm not seeing how to use those to get the desired form with linear factors.
Aug 5, 2022 at 19:02 comment added T. Amdeberhan This is nice and upvoted. But, is there some other ones with linear factors?
Aug 4, 2022 at 10:20 history answered Peter Taylor CC BY-SA 4.0