3tg (pi/3 - 2x) < V3 tg (pi/3 - 2x) < V3/3 tg (pi/3 - 2x) < tg pi/6 -pi + pin < pi/3 - 2x < pi/6 + pin -pi - pi/3 + pin < -2x < pi/6 - pi/3 + pin -4pi/3 + pin < -2x < - pi/6 + pin pi/12 - pin/2 < x < 2pi/3 - pin/2