LN(x)^
2 ≥ LN(x^2)
LN(x)^2 ≥ 2·LN(x)
LN(x)^2 - 2·LN(x) ≥ 0
LN(x) = t
t^2 - 2·t ≥ 0
t·(t - 2) ≥ 0---> t ≤ 0 ∨ t ≥ 2
LN(x) ≤ 0---> 0 < x ≤ 1
LN(x) ≥ 2---> x ≥ e^2
0 < x ≤ 1 ∨ x ≥ e^2
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