A) sin(x - π/6) > 0
arcsin0 + 2πn < x - π/6 < π - arcsin0 + 2πn, n∈Z<br> 2πn < x - π/6 < π + 2πn, n∈Z<br> π/6 + 2πn < x < π + π/6 + 2πn, n∈Z<br> 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