標題: A Math Questions,識計話你醒 [打印本頁] 作者: paultse 時間: 09-3-8 05:40 PM
標題: A Math Questions,識計話你醒
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?