Решите уравнение: \(\huge cosx=1.\)

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