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√3 + 4Sinx = 0
Cos²x Cosx
√3 + 4SinxCosx = 0
Cos²x
√3 + 4SinxCosx = 0
2Sin2x = -√3
Sin2x = -(1/2)√3
2x = 240' + k.360'
x = 120' + k.180'
x = 120' , 300' atau x = (2/3)π . (5/3)π
HP { 2π/3 , 5π/3 }