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

   SYNOPSIS
	  x   = IEEEDPTan(  y  );
	d0/d1		  d0/d1

	double	x,y;

   FUNCTION
	Compute tangent of y in IEEE double precision

   INPUTS
	y - IEEE double precision floating point value

   RESULT
	x - IEEE double precision floating point value

   BUGS

   SEE ALSO
	IEEEDPAtan(), IEEEDPSin(), IEEEDPCos()