Answer
$-\frac{5\pi}{6},-\frac{\pi}{6},\frac{7\pi}{6}$ and $\frac{11\pi}{6}$.
Work Step by Step
Using a graphing utility, the graphs of $y_1$ and $y_2$ are as shown.
From the graph, the real values of $x$ are $-\frac{5\pi}{6},-\frac{\pi}{6},\frac{7\pi}{6}$ and $\frac{11\pi}{6}$.
