atan2(0, 0) = ???

[Brent L. Bates TAD/TAB ms294 x42854]

    atan2 must be wrong. The only invalid input would be NaN or
infinity.
--

	Brent L. Bates
	NASA-Langley Research Center
	M.S. 294
	Hampton, Virginia  23665-5225
	(804) 864-2854
	E-mail: blbates at aero4.larc.nasa.gov or blbates at aero2.larc.nasa.gov