Question

Решите,пожалуйста,неравенство:
cosx<=-1/2

Answer 1

cosx ≤ -1/2
arccos(-1/2) + 2πn ≤ x ≤ 2π - arccos(-1/2) + 2πn, n∈z
2π/3 + 2πn ≤ x ≤ 2π - 2π/3 + 2πn, n∈z
2π/3 + 2πn ≤ x ≤ 4π/3 + 2πn, n∈z