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Square of the length of the tangent draw...

Square of the length of the tangent drawn from the point `(alpha,beta)` to the circle `ax^2 +ay^2=r^2` is

A

1) `aalpha^2+abeta^2-r^2`

B

2) `alpha^2+beta^2-r^2/a`

C

3) `alpha^2+beta^2+r^2/a`

D

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

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