2·TAN(x)^2 - TAN(x) - 1 = 0
TAN(x) = t
(t - 1)·(2·t + 1) = 0
t = - 1/2 ∨ t = 1
quindi:
TAN(x) = - 1/2 : x = - ATAN(1/2) + k·pi
TAN(x) = 1 : x = pi/4 + k·pi
in definitiva: x = - ATAN(1/2) + k·pi ∨ x = pi/4 + k·pi
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