36
punti
Livello 0
* 120° = 2*π/3
* α = arctg(3/4)
* β = 2*π/3 - arctg(3/4) ~= 1.45 rad
* cos(β) = cos(2*π/3 - arctg(3/4)) =
= sin(2*π/3)*sin(arctg(3/4)) + cos(2*π/3)*cos(arctg(3/4)) =
= (√3/2)*(3/5) + (- 1/2)*(4/5) =
= (3*√3 - 4)/10 ~= 0.1196
57798
punti
Genius I