kordianat cartesius dari titik A(2,120⁰) adalah a.([tex] (\sqrt{3} ,1) b. (-1 ,\sqrt{3}) c. (-\sqrt{3} ,1) d. (\sqrt{2} ,1) e. (-\sqrt{2} ,1) [/tex]

(2,120°)
X = a . cos(180°-60°)
X = 2. -cos60°
X = 2. -1/2
X = -1

Y = a. sin(180°-60°)
Y = 2. sin60°
Y = 2. [tex] \sqrt{3/2}[/tex]
Y = [tex] \sqrt{3} [/tex]

X = ( -1 , [tex] \sqrt{3} [/tex]) 
jawaban : B