# Chapter 5 - Section 5.5 - Trigonometric Equations - Exercise Set - Page 705: 140

See explanations.

#### Work Step by Step

There are at lease two ways to check the solutions using a graphing utility. One way is to graph $y=sin(x)$ and $y=cos(2x)$ separately and find the x-coordinates of the intersection points. Another way is to graph the function $y=sin(x)-cos(2x)$ and find the x-intercepts which should give the solutions.

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