SIN(γ) = SIN(pi - 2·α)---> SIN(γ) = SIN(2·α)
SIN(2·α) = 2·SIN(α)·COS(α)
ASIN(α°) = 1/4----> α = 14.175° implica angolo al vertice C ottuso
COS(α) = √(1 - (1/4)^2)---> COS(α) = √15/4
SIN(γ) = 2·1/4·(√15/4)---> SIN(γ) = √15/8
COS(γ) = - √(1 - (√15/8)^2)---> COS(γ) = - 7/8
TAN(γ) = SIN(γ)/COS(γ) = √15/8/(- 7/8)---> TAN(γ) = - √15/7