Решите неравенство :
Решение cos2x ≥ - √2/2 - arccos(-√2/2) + 2πn ≤ 2x ≤ arccos(√2/2) + 2πn, n ∈ Z 3π/4 + 2πn ≤ 2x ≤ π/4 + 2πn, n ∈ Z 3π/8 + πn ≤ x ≤ π/8 + πn, n ∈ Z