$\frac{\sin^2 x}{\cos^2 x} - \frac{4\sin x}{\cos x} + 3 = 0$ denkleminin çözüm kümesi aşağıdakilerden hangisidir?
A) $\{x | x = \frac{\pi}{4} + k\pi, k \in \mathbb{Z}\}$
B) $\{x | x = \frac{\pi}{3} + k\pi, k \in \mathbb{Z}\}$
C) $\{x | x = \frac{\pi}{4} + k\pi \text{ veya } x = \arctan 3 + k\pi, k \in \mathbb{Z}\}$
D) $\{x | x = \frac{\pi}{4} + k\pi \text{ veya } x = \frac{\pi}{3} + k\pi, k \in \mathbb{Z}\}$
