sin(x+120°) - sin(x-120°) = ½√3, untuk 0

TriGonoMetRi

sin (x + 120) - sin (x - 120) = 1/2 √3
2 cos ((x + 120) + (x - 120)) sin ((x + 120) - (x - 120)) = 1/2 √3
2 cos 2x sin 240 = 1/2 √3
2 cos 2x . (-1/2 √3) = 1/2 √3
cos 2x = -1/2

2x = 120° ---> x = 60°
2x = 240° ---> x = 120°

#sesuaikan dg intervalnya...