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The equation of the director circle of t...

The equation of the director circle of the hyperbola `(x^(2))/(16)-(y^(2))/(4)=1` is given by

A

`x^(2)+y^(2)=16`

B

`x^(2)+y^(2)=4`

C

`x^(2)+y^(2)=20`

D

`x^(2)+y^(2)=12`

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The correct Answer is:
D
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