ricorda: 60° = π/3
sen60° / cos60° = [radice(3) / 2] : 1/2 = radice(3);
tan 60° = tan(π/3) = radice(3);
tan(x + 2 π/3) = tan(π/3 + k π);
x + 2 π /3 = π/3 + kπ; k intero;
x = π/3 - 2 π/3 + kπ;
x = - π/3 + kπ.
Ciao @alby
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