Solve the equations for values of $\theta$ such that $-180\le \theta \le 360.$

1. $$2\cos (\theta )-1=0$$
2. $$\tan (\theta )=7-3\tan (\theta )$$
3. $$3\sin (\theta )=2(1-\sin (\theta ))$$

Try and get a single function of $\theta$ on the left, and a number on the right, for example in (a) we can rearrange to