Question Number 89558 by peter frank last updated on 17/Apr/20
$${Show}\:{that}\:{difference} \\ $$$${of}\:{the}\:{focus}\:{distance} \\ $$$${of}\:{any}\:{point}\:{on}\:{hyperbola} \\ $$$${is}\:{equal}\:{to}\:{the}\:{length}\:{of} \\ $$$${the}\:{tranversed}\:{axis} \\ $$