I have read about this method , and how feynman utilized this method. I like doing integrals for fun, but I can't seem to understand the conceptual idea on how to introduce a parameter into the integral. Can someone , in detail, explain to me how to introduce the parameter into the integral ? (Thank you :) )(adsbygoogle = window.adsbygoogle || []).push({});

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# Differentiation under the integral sign

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