how Richard Feynman would integrate 1/(1+x^2)^2
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We can use trig substitution (letting x=tanθ ) to do a typical calculus 2 integral, the integral of 1/(1+x^2)^2. However, we will use Feynman's technique of integration (aka Leibniz's integral rule, aka differentiation under the integral sign) to come up with a very nice integral formula.
Here's the integral of 1/(1+x^2) by using complex numbers 👉 • integral of 1/(x^2+1) but you didn't ...
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