Lesson: Evaluating Trigonometric Functions Using Pythagorean Identities Mathematics • First Year of Secondary School

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In this lesson, we will learn how to use the Pythagorean identities to find the values of trigonometric functions.

Students will be able to

recognize and recall the Pythagorean identities for the trigonometric functions
understand how to find the value of a trigonometric ratio given the value of another, using the Pythagorean identities, in each of the four quadrants;
use the Pythagorean identities in combination with other identities to simplify and evaluate trigonometric expressions.