- $\int k f(x) d x=k \int f(x) d x,(\forall k \neq 0)$.
- $\int f^{\prime}(x) d x=f(x)+C$
- $\int[f(x) \pm g(x)] d x=\int f(x) d x \pm \int g(x) d x$
- $\int[f(x) \cdot g(x)] d x=\int f(x) d x \cdot \int g(x) d x$