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The sine rule(also known as the "law of sines") is: a/sin A = b/sin B = c/sin C where the uppercase letters represent angles of a triangle and the lowercase letters represent the sides opposite the angles (side "a" is opposite angle "A", and so on.) Sine Ratio(for angles of right triangles): Sine of an angle = side opposite the angle/hypotenuse written as sin=opp/hyp.
It is short for sine (pronouncing it as sin annoys many maths teachers). Check this site out for detailed info. http://www.clarku.edu/~djoyce/trig/
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