What is the integration by parts?

The anti-derivative or indefinite integral of a function f(x)is a function F(x)whose derivative is f(x).Then,each differentiation rule should have a corresponding integration rule.Last time we worked with the substitution rule for integration corresponds to the chain rule in differentiation.What

The anti-derivative or indefinite integral of a function f（x）is a function F（x）whose derivative is f（x）.Then,each differentiation rule should have a corresponding integration rule.Last time we worked with the substitution rule for integration corresponds to the chain rule in differentiation.