The cos-function y = cos(x) gives a value y which is from [-1 ... +1]. Its parameter x must be radians, that is for example -2*pi ... +2*pi, also values > 2*pi are allowed.
Therefore the parameter y of the restricted inverse function x = acos(y) must always be from [-1 ... +1]. x is then from restricted domain [pi .. 0] because cos is periodic.
As for your program:
>> a=Integer.parseInt (args);
a can be a parameter for acos function if a is from [-1..+1]. If not, NaN would be the result.
should be: b = Math.acos(a);
The result b is radians. You can convert it into degrees: b_degrees = b * 180 / pi or b_degrees = Math.acos(a) * 180 / pi, where pi = 3.14159265358979 or 4*atan(1).
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