Answer :

2θ=sin^-1(0.5)
Degrees:
2θ=30,150,390,510...
θ=15,75,195,255...

Radians:
2θ=π/6,5π/6,13π/6,17π/6...
θ=π/12,5π/12,13π/12,17π/12...

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