value = Acs ( Number )
value = ACos ( Number )
Computes the arc-cosine of a number.
PRINT Acs(0.5) 1.047197551197
PRINT Acs(-1) 3.14159265359
Acsh / ACosh, Asn / ASin, Asnh / ASinh, Cos, Cosh, Deg, Rad, Pi, Sin, Sinh