## Trigonometry (11th Edition) Clone

The corresponding values of $\theta$ are $$\{60^\circ,210^\circ,240^\circ,310^\circ\}$$
1) The question asks for solutions over the interval $[0^\circ, 360^\circ)$, meaning that $$\theta\in[0^\circ,360^\circ)$$ or $$0^\circ\le\theta\lt360^\circ$$ 2) Now from also the question, your work leads to $$3\theta=180^\circ,630^\circ,720^\circ,930^\circ$$ To find corresponding values of $\theta$ from $3\theta$, we divide both sides by $3$ $$\theta=60^\circ,210^\circ,240^\circ,310^\circ$$ 3) Finally, it is crucial to compare the values of $\theta$ in 2) with the range found in 1). We see that all four values of $\theta=60^\circ,210^\circ,240^\circ,310^\circ$ fit in the range of $\theta\in[0^\circ,360^\circ)$. None would be eliminated as a result. The corresponding values of $\theta$ are $$\{60^\circ,210^\circ,240^\circ,310^\circ\}$$