Trigonometric identities

A mathematical identity that expresses a mathematical relation between trigonometric functions is called a trigonometric identity.

Basic identities

There are four types of fundamental trigonometric identities in trigonometry. If you are a beginner, start your learning from the following four trigonometric rules.

Quotient identities
Pythagorean identities
Reciprocal identities
Product identities

Advanced identities

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