Answer :
Cos36 = 0.84
Cos72 = 0.43
Cos108 = -0.13
Cos144 = -0.64
Cos36xCos72xCos108xCos144 = 0.84 x 0.43 x (-0.13) x (-0.64)= 0.03
Hope that it helps :)
Cos72 = 0.43
Cos108 = -0.13
Cos144 = -0.64
Cos36xCos72xCos108xCos144 = 0.84 x 0.43 x (-0.13) x (-0.64)= 0.03
Hope that it helps :)