TAN(x)^2 ≤ √3·TAN(x)
TAN(x) = t
t^2 - √3·t ≤ 0----> 0 ≤ t ≤ √3
0 ≤ TAN(x) ≤ √3
k·pi ≤ x ≤ pi/3 + k·pi
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