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Learning Feynman's Trick for Integrals
.k.a. Differentiation under the Integral Sign & Leibniz Integral Rule Among a few other integral tricks and techniques, Feynman's trick was a strong reason that made me love evaluating integrals, and although the technique itself goes back to Leibniz being commonly known as the Leibniz integral rule, it was Richard Feynman who popularized it, which is why it is also referred to as Feynman's trick.
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