1. The problem statement, all variables and given/known data In differentiation we use the chain rule to find the derivative of a function within other function [f(g(x))] Is there any similar method for indefinite integration for example how am I supposed to find the integral of e^(4x^3+6x^2+8x+9) or sin(x^2). 2. Relevant equations none 3. The attempt at a solution Couldn't reach anywhere!!!