1MiB, 2271x3504, trianon.jpg View SameGoogleiqdbSauceNAO Anonymous Sat 26 Oct 10:35:24 2019 No.11092633 ViewReplyOriginalReport Quoted By: >>11094131 Why do physicist call Leibniz's rule / differentiation under the integral sign Feynman's trick but make fun of biologists for calling the trapezoid rule Tai's method.