NAME
        IEEESPTan -- compute the tangent of a floating point number

   SYNOPSIS
          x   = IEEESPTan(  y  );
        d0                d0

        float   x,y;

   FUNCTION
        Compute tangent of y in IEEE single precision

   INPUTS
        y - IEEE single precision floating point value

   RESULT
        x - IEEE single precision floating point value

   BUGS

   SEE ALSO
        ieeespatan(), ieeespsin(), ieeespcos()