0
SinX + Sin2X = 0
SinX + 2SinXCosX = 0
Factor
SinX(1 - 2CosX) = 0
Hence
SinX = 0
X = = 0 , 180, 360, ....
&
1 - 2CosX = 0
2CosX = 1
Cos X = 1/2 = 0.5
X = 60, 240, 420, ....
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