Trigonometric Identities

Trigonometric identities come in handy whenever trigonometric functions are involved in an equation or an expression. These identities are true for every value of variables occurring on both sides of an equation. Geometrically, they involve certain trigonometric functions (such as sine, cosine, and tangent) of one or more angles.

Sine, cosine and tangent are known as the primary trigonometry functions, whereas secant, cosecant, and cotangent are the other three functions. Trigonometric identities are based on all six of these trigonometric functions.

In this ebook you will learn more about trigonometric identities and related formulae.