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

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

A

`(alpha^2+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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The correct Answer is:
B
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