Expii

# Integration by Parts - Expii

Integration by parts is the counterpart of the product rule for derivatives. It allows us to integrate products of functions. It is often written as $$\int f(x) g(x) \, dx = F(x) g(x) - \int F(x) g'(x) \, dx$$ or $$\int u \, dv = uv - \int v\, du$$.