# Chapter 4 - Section 4.4 - Trigonometric Functions of Any Angle - Exercise Set - Page 576: 108

Let us consider an angle $\theta$ which is not an acute angle that lies in a quadrant. The positive acute angle formed by the x-axis and the terminal side of $\theta$, is the reference angle ${\theta }'$.The reference angle varies according to the quadrant in which $\theta$ lies.

#### Work Step by Step

Given above.

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