Question

Решите неравенства: cos х/2 больше чем 1/2

Answer 1

cos(x/2) > 1/2
- arccos(1/2) + 2πn < x/2 < arccos(1/2) + 2πn, n∈Z
- π/3 + 2πn < x/2 < π/3 + 2πn, n∈Z
- 2π/3 + 4πn < x < 2π/3 + 4πn, n∈Z