Trigonometric formulas (trigonometric formulas) or trigonometric identities describe the relationship between sine, cosine, tangent, and cotangent and are used in solving mathematical problems.

Trigonometric formulas:
- Basic trigonometric identities
- Formulas of the double argument
- Formulas of the triple argument
- Half-argument formulas
- Squares formulas for trigonometric functions
- Cube formulas for trigonometric functions
- Formulas of trigonometric functions in the fourth degree
- Addition and difference formulas for trigonometric functions
- Formulas for the sum of trigonometric functions
- Difference formulas for trigonometric functions
- Formulas of products of trigonometric functions
- Equivalence formulas for trigonometric functions
- Table of values ​​of the main trigonometric functions
- The solution of trigonometric equations
- Relations of inverse trigonometric functions
- Signs of trigonometric functions in quarters
- Trigonometric constants