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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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COS(x)
COS function returns the cosine of @x, where @x is given in radians.
This function is Excel compatible.
COS(0.5) equals 0.877583.
COS(1) equals 0.540302.
COSH, SIN, SINH, TAN, TANH, RADIANS, DEGREES.
