how Richard Feynman would integrate 1, (1+x 2) 2

Learn more problemsolving techniques on Brilliant: (20 off with this link ) We can use trig substitution (letting xtanθ ) to do a typical calculus 2 integral, the integral of 1, (1+x2)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+x2) by using complex numbers Shop math tshirts hoodies: 10 off with the code WELCOME10 Thanks to ALL my lovely patrons for supporting my channel and believing in what I do APIP Ben Delo Marcelo Silva Ehud Ezra 3blue1brown Joseph DeStefano Mark Mann Philippe Zivan Sussholz AlkanKondo89 Adam Quentin Colley Gary Tugan Stephen Stofka Alex Do