NAME
    IEEESPSincos -- compute the arc tangent of a floating point number
SYNOPSIS
      x   = IEEESPSincos( z ,  y  );
    d0                   a0  d0
    float   x,y,*z;
FUNCTION
    Compute sin and cosine of y in IEEE single precision.
    Store the cosine in *z. Return the sine of y.
INPUTS
    y - IEEE single precision floating point value
    z - pointer to IEEE single precision floating point number
RESULT
    x - IEEE single precision floating point value
BUGS
SEE ALSO
    IEEESPSin(), IEEESPCos()