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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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TAN(x)
TAN function returns the tangent of @x, where @x is given in radians.
This function is Excel compatible.
TAN(3) equals -0.1425465.
TANH, COS, COSH, SIN, SINH, DEGREES, RADIANS.
