Integrals of the elementary functions and some little bit complex expressions often occur in practice are presented. The main idea behind the
calculation of indefinite integral
is to use various transformations to convert the initial integral to the elementary one. Some of the elementary integrals are presented below.

## 1. Power function:

## 2. Exponential and logarithmic functions:

## 3. Trigonometric functions:

## 4. Inverse trigonometric function:

## 5. Fractional rational function: