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 tand(3M)							    tand(3M)




 NAME
      tand(), tandf() - degree-valued tangent functions

 SYNOPSIS
      #include <&lt&lt&lt;math.h>&gt&gt&gt;

      double tand(double x);

      float tandf(float x);

 DESCRIPTION
      tand() is a degree-valued version of the tan() function.	It returns
      the tangent of x (x specified in degrees).

      tand() may lose accuracy when x is far from zero.

      tandf() is a float version of tand(); it takes a float argument and
      returns a float result.

      tand() and tandf() are not specified by any standard, but tandf() is
      named in accordance with the conventions specified in the "Future
      Library Directions" section of the ANSI C standard.

      To use these functions, compile either with the default -Ae option or
      with the -Aa and -D_HPUX_SOURCE options.	Make sure your program
      includes <math.h>.  Link in the math library by specifying -lm on the
      compiler or linker command line.

 RETURN VALUE
      If x is NaN or +-INFINITY, tand() returns NaN.

      If the correct value after rounding would be smaller in magnitude than
      MINDOUBLE, tand() returns zero.

      If the correct value would overflow, tand() returns +-HUGE_VAL and
      sets errno to [ERANGE].

 ERRORS
      If tand() fails, errno is set to the following value.

	   [ERANGE]	       The correct value would overflow.

 SEE ALSO
      acosd(3M), asind(3M), atand(3M), atan2d(3M), cosd(3M), sind(3M),
      tan(3M), math(5), values(5).









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