CAPE Pure Mathematics Unit 1 · May/June 2014 · Paper 1 · Question Q21

What value of \theta, 0 \le \theta \le \pi, satisfies the equation 2\cos^2\theta + 3\cos\theta - 2 = 0?

1. (A)\frac{\pi}{6}
2. (B)\frac{\pi}{4}
3. (C)\frac{\pi}{3}
4. (D)\frac{\pi}{2}