cos2d = cos(2*30°) = cos(60°) ≈ 0.5
cos3d = cos(3*30°) = cos(90°) = 0
Таким образом, cos2d ≈ 0.5 и cos3d = 0.
cos2d = cos(2*30°) = cos(60°) ≈ 0.5
cos3d = cos(3*30°) = cos(90°) = 0
Таким образом, cos2d ≈ 0.5 и cos3d = 0.