## Definition

The derivative of a function **y = f (x)** at one point **x = x**_{0}, is equal to the value of the trigonometric tangent of the angle formed by the geometric tangent to the representative curve of **y = f (x)**at the point **x = x _{0}**, ie the derivative is the angular coefficient of the line tangent to the graph of the function at the point

**x**.

_{0}The derivative of a function y = f (x) can also be represented by the symbols:**y '**, **dy / dx** or **f '(x)**.

The derivative of a function f (x) at point x_{0} is given by:

## Some basic derivatives

In the formulas below, **u** and **v** are functions of the variable * x*.

**The**, **B**, **ç** and **no** are constant.

### Derived from a constant

### Power derivative

Therefore: