Question

cosx≥1/2 решить неравенство

Answer 1

$cosx geq dfrac{1}{2} \ \ -arccos dfrac{1}{2}+ 2 pi n leq x leq arccos dfrac{1}{2} + 2 pi n, n in Z \ \ boxed{ - dfrac{ pi }{3} + 2 pi n leq x leq dfrac{ pi }{3} + 2 pi n, n in Z}$