2·SIN(x)^2 - 3·SIN(x) = -1
pongo: SIN(x) = t
2·t^2 - 3·t + 1 = 0---> (t - 1)·(2·t - 1) = 0
quindi: t = 1/2 ∨ t = 1
SIN(x) = 1/2: x = 5·pi/6+2·k·pi ∨ x = pi/6 +2·k·pi
SIN(x) = 1 : x = pi/2 + 2·k·pi
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