## Basic trigonometry formulas

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### An Introduction to Trigonometry

LSC-Montgomery Learning Center: Basic Review of Trigonometry Page 3 Last Updated April 13, 2011 BASIC TRIGONOMETRIC IDENTITIES 1. Definitions cos sin tan sin cos cot cos cos 1 sec sin 1 csc 2. Pythagorean Identities sin2 + cos2 = 1 tan2 2+ 1 = sec2 cot2 + 1 = csc2 sin 3. Addition/Subtraction Formulas sin (A + B) = sin A cos B + cos A sin B

### TRIGONOMETRY NOTES By STEVEN SY Copyright 2008

An Introduction to Trigonometry P.Maidorn I. Basic Concepts The trigonometric functions are based on the unit circle, that is a circle with radius r=1. Since the circumference of a circle with radius r is C=2Br, the unit circle has circumference 2B. For any point (x,y) on the unit circle, the associated angle 2 can be measured in two different

### TRIGONOMETRY FORMULAS = sec x cot 2 (x) +1 = csc x

1 Right Triangle Trigonometry Trigonometry is the study of the relations between the sides and angles of triangles. The word “trigonometry” is derived from the Greek words trigono (τρ´ιγων o), meaning “triangle”, and metro (µǫτρω´), meaning “measure”. Though the ancient Greeks, such as Hipparchus