"Prove that the product of the perpendiculars from `(alpha,beta)` to the pair of lines `a x^2+2h x
Channel: Doubtnut
Date: 2020-06-28

"Prove that the product of the perpendiculars from `(alpha,beta)`
 to the pair of lines `a x^2+2h x y+b y^2=0`
 is
 `(aalpha^2+2halphabeta+b beta^2)/(sqrt((a-b)^2+4h^2))`"