If the ratio of the distance from a vertex of hyperbola to the corresponding quasilinear to the distance from this point to another focus is λ, then the value range of λ is? No derivative algorithm

If the ratio of the distance from a vertex of hyperbola to the corresponding quasilinear to the distance from this point to another focus is λ, then the value range of λ is? No derivative algorithm

The distance | A-A & sup2 / / C | = | a (A-C) / C from a vertex a of hyperbola to corresponding quasilinear A & sup2 / / C|
The ratio of the distance | a-c | from this point a to the other focus C is
λ=|a(a-c)/c|/|a-c|=|a|/c
∵c=√a²+b² ∴c>a
The range of λ is 0