sin(360+30) =sin(30)= 1/2
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Sin(X) = 0.9 X = Sin^(-1) 0.9 X = 64.158... degrees.
sin(90) = 1
0.7771459615
Sin(285) is a number, not an angle. The reference angle for 285 degrees is 285-360 = -75 degrees.
The answer is 42.