A Math Questions,識計話你醒

paultse

The graph of the equation [(x-12)^2 ]/ (12^2)+ (y^2)/(5^2) =1 is an
ellipse passing through the origin ,Let (xo,yo) be any point on the
ellipse with yo>0


Q)Consider the circle centered at the origin with radius h, of which the equation is x^2+y^2=h^2 . Denote the intersection of this circle with the positive y – axis by Q while the intersection of this circle and the ellipse in the first quadrant is denoted by P ,

then If xL is the x – intercept of the line passing through P and Q,
what is the range of xL as h varies?