UNBELIEVABLE calculus result using Feynman integration

Definitely one of the most beautiful results ever published! Important derivatives of the gamma function: https://www.instagram.com/p/Cuak4YaNR... Integral for η'(1):    • ONE OF THE COOLEST INTEGRALS EVER!!! int l...   My new channel for formal math courses: https://youtube.com/@TheHouseOfMathne... If you like the videos and would like to support the channel:   / maths505   You can follow me on Instagram for write ups that come in handy for my videos: https://instagram.com/maths.505?igshi... My LinkedIn:   / kamaal-mirza-86b380252