\(f(x) = 6\sin x-3\) . Решите уравнение \(f'(x) = 0\) .

• \(x = \frac{\pi}{2} + \pi k, k ∈Z\)
• \(x=πk, k∈Z\)
• \(x = \pm\frac{\pi}{3} + 2\pi k, k ∈Z\)
• \(x = (-1)^k\frac{\pi}{6} + \pi k, k ∈Z\)