Решите неравенство: а) sin (x-П/6) больше 0

б) tgx (x-П/4) меньше или равно 0

A) sin (x - π/6) > 0

arcsin0 + 2πn < x - π/6 < π - arcsin0 + 2πn, n∈Z

2πn < x - π/6 < π + 2πn, n∈Z

π/6 + 2πn < x < π + π/6 + 2πn, n∈Z

π/6 + 2πn < x < 7π/6 + 2πn, n∈Z

б) tgx (x - π/4) ≤ 0

- π/2 + πn ≤ x - π/4 ≤ arctg0 + πn, n∈Z

- π/2 + π/4 + πn ≤ x ≤ π/4 + πn, n∈Z

- π/4 + πn ≤ x ≤ π/4 + πn, n∈Z