COS(β) = 3/9 = 1/3
SIN(γ) = 3/9 = 1/3
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TAN(β) = SIN(β)/COS(β)
con
SIN(β) = √(1 - (1/3)^2)----> SIN(β) = 2·√2/3 si ottiene
TAN(β) = 2·√2/3/(1/3)-------> TAN(β) = 2·√2
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COS(γ) = √(1 - (1/3)^2)-----> COS(γ) = 2·√2/3