updating oE arccos


include math.e 
namespace math 
public function arccos(trig_range x) 

returns an angle given its cosine.

  1. value : an object, each atom in which will be acted upon.

An object, the same shape as value. When value is an atom, the result is an atom, an angle whose cosine is value.


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.


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:

cos, PI, arctan

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