acos - luxembourg/muxcode-clm GitHub Wiki
ACOS()
FUNCTION: acos(<number>[, <units>])
Returns the arc-cosine of <number>. The value returned will be expressed in <units>. <units> may be 'radians', 'degrees', or 'gradians' or just the first letter of any of these. By default, <units> is 'radians'.
In a circle, there are 2*pi() radians, 360 degrees, and 400 gradians.
Examples: > say acos(0) You say, "1.570796" > say acos(1) You say, "0" > say acos(0.707101) You say, "0.785406" > say acos(0.866025) You say, "0.5236"