Lesson: Simplifying Trigonometric Expressions Using Trigonometric Identities Mathematics • First Year of Secondary School

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In this lesson, we will learn how to simplify trigonometric expressions by applying trigonometric identities.

Students will be able to

identify whether an equation represents an identity,
recall and use the Pythagorean identities to simplify expressions,
use combinations of trigonometric identities, including cofunction identities, shift identities, and Pythagorean identities, to simplify expressions, including reciprocal trigonometric functions,
use the trigonometric identities to simplify rational trigonometric expressions.