Trigonometry

This document covers the most important trigonometric identities, making it an essential resource for students studying high school or college-level math. It includes: Defining Relations: Understand how tangent, cotangent, secant, and cosecant are expressed using sine and cosine. The Pythagorean Identity: A key formula in trigonometry for sines and cosines. Co-function Identities: Explains how trig functions relate to their complements. Periodicity of Functions: Learn the periodicity of sine, cosine, tangent, and other trig functions. Negative Angle Identities: Clarifies odd and even function properties for sine, cosine, tangent, and others. Sum and Difference Formulas: Includes Ptolemy’s identities and formulas for sine and cosine. Double Angle Formulas: Detailed explanation of the double angle formulas for sine and cosine. Whether you’re preparing for exams or need a quick reference guide, this document provides all the essential trigonometric identities in an easy-to-understand format.