How to change the order of a double integral

Change the order of integration in a double integral, ft, integral of ln(1+x)/x using power series,

integral of ln(1+x) from 0 to 1, https://www.wolframalpha.com/input/?i...

how to get pi^2/12, 1-1/4+1/9-1/16+...  (zeta function & ...

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