updating oE arccos
arccos
include math.e namespace math public function arccos(trig_range x)
returns an angle given its cosine.
Parameters:
 value : an object, each atom in which will be acted upon.
Returns:
An object, the same shape as value. When value is an atom, the result is an atom, an angle whose cosine is value.
Errors:
If any atom in value is not in the 1..1 range, it cannot be the cosine of a real number, and an error occurs.
Comments:
A value between 0 and PI radians will be returned.
This function may be applied to an atom or to all elements of a sequence.
arccos is not as fast as arctan.
Example 1:
s = arccos({1,0,1})  s is {3.141592654, 1.570796327, 0}
See Also:
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