Решите уравнение \(-2\cos x = \sqrt{2}\) .

• \(\pm\frac{3\pi}{4}+2\pi k, k \in Z\)
• \(\pm\frac{\pi}{4}+2\pi k, k \in Z\)
• \(\pm\frac{3\pi}{4}+\pi k, k \in Z\)
• \((-1)^k\frac{3\pi}{4}+\pi k, k \in Z\)