2·SIN(x)^2 - SIN(x) > 0
SIN(x) = t
2·t^2 - t > 0
t < 0 ∨ t > 1/2
SIN(x) < 0: pi + 2·k·pi < x < 2·pi + 2·k·pi
SIN(x) > 1/2: pi/6 + 2·k·pi < x < 5/6·pi + 2·k·pi
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