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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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COS(x)
COS geeft de cosinus van @x, met @xin radialen.
Deze functie is compatibel met Excel.
COS(0,5) is 0,877583
COS(1) is 0,540302
COSH, SIN, SINH, TAN, TANH, RADIANS, DEGREES.
