Решите уравнение \(3\cos^2 t-8\cos t+4=0.\)

• \(\pm \arccos \frac{2}{3}+2\pi n, n\in Z\)
• \(\arccos \frac{2}{3}+2\pi n, n\in Z\)
• \(\pm \arccos \frac{2}{3}+2\pi n, n\in Z, \pm \arccos {2}+2\pi k, k\in Z\)
• \(\pm\arccos \frac{2}{3}+\pi n, n\in Z\)