A fascinating integral solved using Feynman's technique: int (0,infty) ln(x)/(1+cosh(x))

An eventful solution development with a melin transform as a little side quest.

The derivative of the eta and zeta functions:
https://youtu.be/DiLo9i6Io0M?si=hLs9C6nVzFPDKIti

My complex analysis lectures:
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