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

B

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

C

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

D

None of these

Text Solution

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The correct Answer is:
B
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