Tg(2x+π / 4)⩾-1 Помогите с решением
-π/4 + πk ≤ 2x+π/4 ≤ π/2 +πk, k∈Z -π/4 - π/4 + πk ≤ 2x ≤ π/2 - π/4 + πk -π/2 + πk ≤ 2x ≤ π/4 + πk -π/4 + πk/2 ≤ x ≤ π/8 + πk/2, k∈Z