(sqrt(6)-sqrt(2))/4
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sine(15 degrees) = 0.25882 (rounded)
sine tables, that's how they did it before calculators, there are formulas as well
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Sine 3.3 degrees is about 0.057564. Sine 3.3 radians is about -0.157746. Sine 3.3 grads is about 0.051813.
mostly it comes from memorization. If sin 30 = 1/2, then arcsin (1/2) = 30