Hello everyone,(adsbygoogle = window.adsbygoogle || []).push({});

This is my first post. I would like to understand better the idea of differentiation under the integral sign. I read about it in

http://mathworld.wolfram.com/LeibnizIntegralRule.html and Feynman's autobiography, about evaluating an integral by differentiation under the integral sign, but how exactly it is done.

Thank to everyone.

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# Differentiation under the integral sign

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