double sin30 = Math.Sin(30 * (Math.PI / 180));
double sin90 = Math.Sin(90 * (Math.PI / 180));sin30 = 0.49999999999999994
sin90 = 1.0
double sin90 = Math.Sin(90 * (Math.PI / 180));sin30 = 0.49999999999999994
sin90 = 1.0
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