Acos()
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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.
Example
> 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"