Решите уравнение: \(\huge {cosx=0}.\)

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