Решите неравенство cos x < 1/3

Question

Решите неравенство

cos x < 1/3

Answer 1

Cosx<1/3<br>x∈(arccos1/3+2πk;2π-arccos1/3+2πk,k∈z)

Answer 2

x => arccos1/3+2пn;2п-arccos1/3+2пn