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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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TAN(x)
TAN geeft de tangens van @x, met @x in radialen.
Deze functie is compatibel met Excel.
TAN(3) is -0,1425465
TANH, COS, COSH, SIN, SINH, DEGREES, RADIANS.
