B and C are two points on the circle x^2...

B and C are two points on the circle `x^2+y^2=a^2` point A (b,c) lies on that circle such that AB = AC = d, then the equation of the line `harr(BC)` is

`bx+ay=a^2-d^2`

`bx+ay=d^2-a^2`

`2(bx+cy)=2a^2-d^2`

`2(bx+ay)=2a^2-d^2`

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