Definition domain of the ACOS function

[karimall72]

Evaluation of ACOS(-2) throws a NumberFormatException.

It would be preferable to throw an EvaluationException, as you have already done for the ASIN() function.

See issue #361: Evaluation of asin(1.5) will throw NumberFormatException which is a bit misleading

Remark:
There could be another way (the basic Java way for invalid math) for this general topic : to accept that EvaluationValue could hold Double.NaN or Float.NaN. But it is a matter of choice…