Lesson: Trigonometric Functions’ Values with Reference Angles Mathematics • First Year of Secondary School

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In this lesson, we will learn how to find reference angles and how to use them to find the values of trigonometric functions.

Students will be able to

identify the principal angle for a given angle,
use principal angles to find the value of trigonometric functions where the angles are outside of the range between and or 0 radians and radians.

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