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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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ACOS(x)
ACOS function calculates the arc cosine of @x; that is the value whose cosine is @x. If @x falls outside the range -1 to 1, ACOS fails and returns the #NUM! error. The value it returns is in radians.
This function is Excel compatible.
ACOS(0.1) equals 1.470629.
ACOS(-0.1) equals 1.670964.
COS, SIN, DEGREES, RADIANS.
