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A beautiful result in calculus: Solution using Feynman integration ( Integral cos(x)/(x^2+1) )
Flammable Maths
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Integration By Differentiating Under The Integral Sign (HBD Feynman)
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integral of sin(x)/x from 0 to inf by Feynman's Technique
blackpenredpen
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Around The Corner - How Differential Steering Works (1937)
US Auto Industry