\({\sin ^2}x - 3\sin x\cos x =  - 1.\)

Câu hỏi: \({\sin ^2}x - 3\sin x\cos x =  - 1.\)

A \(\left[ \begin{array}{l}x =  - \frac{\pi }{4} + k\pi \\x = \arctan \left( { - \frac{1}{2}} \right) + k\pi \end{array} \right.\,\,\,\,\left( {k \in \mathbb{Z}} \right)\)

B \(\left[ \begin{array}{l}x = \frac{\pi }{4} + k\pi \\x = \arctan \frac{1}{2} + k\pi \end{array} \right.\,\,\,\,\left( {k \in \mathbb{Z}} \right)\)

C \(\left[ \begin{array}{l}x = \frac{\pi }{4} + k2\pi \\x = \arctan \frac{1}{2} + k2\pi \end{array} \right.\,\,\,\,\left( {k \in \mathbb{Z}} \right)\)

D \(\left[ \begin{array}{l}x =  - \frac{\pi }{4} + k2\pi \\x = \arctan \left( { - \frac{1}{2}} \right) + k2\pi \end{array} \right.\,\,\,\,\left( {k \in \mathbb{Z}} \right)\)