# Mathematics

### Trigonometry

Basic properties and graphs of trigonometric functions

Reduction formulas

Addition formulas

Inverse trigonometric functions

Trigonometric functions of an arbitrary angle

Trigonometric equations

Properties of trigonometric functions

Formulas of trigonometric functions of double and half angles

Degree and radian measures of the angle

Identical transformations of trigonometrical expressions

Trigonometric inequality

Basic trigonometric identities

Converting the sum and difference of trigonometric functions into a product

Equations involving inverse trigonometric functions

System of trigonometric equations

The inequalities containing the inverse trigonometrical functions

Transformation products of trigonometric functions in the sum or difference