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1 it can not used when the angle more than 45 degrees.....
Sine does not converge but oscillates. As a result sine does not tend to a limit as its argument tends to infinity. So sine(infinity) is not defined.
The sine of 22.5 degrees is 0.383
sine-1(0.3420201433) = 20 degrees
its short for sine. theres sine, cosine, and tangent. sine is opposite over adjacent for the sides of a triangle (or angles)