integration by parts, DI method, VERY EASY

Why DI method works: integral of x^2*sin(3x), @0:06 integral of x^4*ln(x), @5:34 integral of e^x*sin(x), @10:05 integral of e^x sinx, integral of x^2*sin(3x), integral of x^4*ln(x) integration by parts, DI method, solution playlist page Easiest way to set up the integration by parts, DI method, all 3 stops, all 3 situations, with 3 typical examples, Tabular Integration, blackpenredpen, math for fun | 曹老師數學