Решите уравнение: \(\huge cosx=-1.\)

• \(\huge {x=\pi + 2\pi k, k \in Z}\)
• \(\huge {x={{ \pi} \over {2}} + \pi k, k \in Z}\)
• \(\huge {x=\pi + \pi k, k \in Z}\)
• \(\huge {x= \pi k, k \in Z}\)
• \(\huge {x=2 \pi k, k \in Z}\)