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List of trigonometric identities

In trigonometry, trigonometric identities are equalities that involve trigonometric functions and are true for every value of the occurring variables for which both sides of the equality are defined. Geometrically, these are identities involving certain functions of one or more angles. They are distinct from triangle identities, which are identities…

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Overview

Pythagorean identities

Reflections, shifts, and periodicity

Angle sum and difference identities

Multiple-angle and half-angle formulas

Power-reduction formula

Product-to-sum and sum-to-product identities

Linear combinations

Lagrange's trigonometric identities

Certain linear fractional transformations

Relation to the complex exponential function

Relation to complex hyperbolic functions

Series expansion

Infinite product formulae

Inverse trigonometric functions

Identities without variables

Composition of trigonometric functions

Historical shorthands

Miscellaneous

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List of trigonometric identities

Nodes128
Edges127
Triples0
Avg. degree1.98
Density0.015625
Components1

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