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Brilliant's article on the digamma functions:
https://brilliant.org/wiki/digamma-function/#:~:text=The%20digamma%20function%20usually%20denoted,derivative%20of%20the%20gamma%20function.
This video is definitely my favourite log-trig integral video so far
The video about the derivatives of the gamma function:
https://youtu.be/lNTpB5OvsHY
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