Answer
$\frac{\pi}{4},\frac{3\pi}{4},\frac{5\pi}{4},\frac{7\pi}{4}$
Work Step by Step
Step 1. Rewrite the equation $tan\theta=\frac{1}{tan\theta}$ or $tan\theta=\pm1$.
Step 2. $tan\theta= 1$, we have $\theta=\frac{\pi}{4},\frac{5\pi}{4}$
Step 3. $tan\theta=-1$, we have $\theta=\frac{3\pi}{4},\frac{7\pi}{4}$
