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A line is drawn through a fixed point P(...

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

A

`(alpha+beta)^2-r^2`

B

`alpha^2+beta^2-r^2`

C

`(alpha-beta)^2+r^2`

D

none of these

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PATHFINDER-CIRCLE-QUESTION BANK
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