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Equation of tangent drawn to circle abs(...

Equation of tangent drawn to circle `abs(z)=r` at the point `A(z_(0))`, is

A

`Re(z/z_(0))=1`

B

`Im(z/z_(0))=1`

C

`Im(z_(0)/z)=1`

D

`zbar(z_(0))+z_(0)bar(z)=2r^(2)`

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The correct Answer is:
A, D
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