hey! what other numbers can be the solution for cos alpha = -0.5 , rather than 120°?
120° + 360° = 480° 480° + 360° = 840° ... or 120° - 360° = - 240° ...
240° + 360° = 600° 600° + 360° = 960° ... or 240° - 360° = - 120° ...
Thank you <3
