2. Solve $2\sin^2\theta - 3\sin\theta + 1 = 0$ for $\theta$ in the interval $[0, 2\pi]$.
3. For a triangle with $\angle A = 45^\circ$, $a = 6$ and $b = 9$, use the Law of Sines to find $\angle B$.
4. In triangle ABC, $\angle A = 40^\circ$, $\angle B = 30^\circ$ and side $a = 12$ cm. Find side $b$