Question 925406
{{{x^2/y^2 = (r^2+2rs+s^2)/(R^2-s^2) = ((r+s)(r+s))/((r-s)(r+s))}}}
 {{{x^2/y^2 = (r+s)/(r-s)}}} 
 x/y =  ±  (r+s)/(r-s)