This is part of the HSC Mathematics Advanced course under the topic of Integral Calculus: The anti-derivative
In this post, we define anti-differentiation as the reverse of differentiation and use the notation \int f(x) dx for anti-derivatives or indefinite integrals. We also recognise that any two anti-derivatives of f(x) differ by a constant.
Primitive Functions (1 of 2: What is anti-differentiation?)
Primitive Functions (2 of 2: Basic example question)
Eddie Woo: Primitive Functions (1 of 4: Introduction and rules of Anti-Differentiation)