Title: 4_3 Trigonometric Identities
Course: HELM Workbooks 2023-2024 > Section: HELM 4: Trigonometry

A trigonometric identity is a relation between trigonometric expressions which is true for all valuesof the variables (usually angles). There are a very large number of such identities. In this Section wediscuss only the most important and widely used. Any engineer using trigonometry in an applicationis likely to encounter some of these identities.