Răspuns :
sin² x + cos² x = 1 => sin x =√( 1 - cos²x) = √ [1 - (√3/2)²] = √( 1 - 3/4) = √1/4 = 1/2
tg x = sin x / cos x = 1/2 / √3/2 = 1/ 2 · 2/√3 = 1/√3 = √3/3
tg x = sin x / cos x = 1/2 / √3/2 = 1/ 2 · 2/√3 = 1/√3 = √3/3