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	IEEESPSincos -- compute the arc tangent of a floating point number 

	  x   = IEEESPSincos( z ,  y  );
	d0		     a0  d0
	float	x,y,*z;

	Compute sin and cosine of y in IEEE single precision.
	Store the cosine in *z. Return the sine of y.

	y - IEEE single precision floating point value
	z - pointer to IEEE single precision floating point number

	x - IEEE single precision floating point value

	Not very fast if no FPU is available. Otherwise, it might be
	faster than calling IEEEDPSin() and IEEEDPCos() separately.