Răspuns :
Salut,
cos 120 = cos (180-60) = cos 180•cos60+sin180•sin60 = -1•1/2+0•√3/2 = -1/2.
Succes! :3
cos 120 = cos (180-60) = cos 180•cos60+sin180•sin60 = -1•1/2+0•√3/2 = -1/2.
Succes! :3