Function Sin Cos Tan Cot

Even-Odd Identities

Reciprocal Identities

Quotient Identities

Pythagorean Identities

The Pythagorean theorem is a statement about triangles containing a right angle. The Pythagorean theorem states that: "The area of the square built upon the hypotenuse of a right triangle is equal to the sum of the areas of the squares upon the remaining sides."

Co-function Identities

Sum-Difference Formulas

Double Angle Identities

Power-Reducing/Half angle formulas

Sum-to-Product Formulas

Product-to-Sum

Derivatives of Trigonometric Functions

Laws of Sines and Cosines The law of Sines : The law of Cosines :