A line is drawn through a fixed point `P(alpha, B)` to  cut the circle `x^(2)+y^
Channel: Doubtnut
Date: 17/05/2020

A line is drawn through a fixed point `P(alpha, B)` to  cut the circle `x^(2)+y^(2)=r^(2)` at A and B. Then PA.PB is equal to