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Another contributor says:
Yes, x=0 is a solution, but there are a lot more.
sin(2x) = sin(x) whenever
x = (N pi) radians
or
x = (2N-1) pi / 3 radians.
1 radian = 57.3 degrees (rounded)
Make ' N ' any whole number you want.
The first cycle of angles are:
X = pi/3, pi, 5 pi/3, 2 pi radians
or 60, 180, 300, 360 degrees.
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