## Precalculus (6th Edition) Blitzer

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.