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What is the equation of the auxiliary ci...

What is the equation of the auxiliary circle of `(x^2)/(16) - y^2/9 = 1 ?`

A

`x^2+y^2 = 9`

B

`x^2 +y^2 = 25`

C

`x^2 +y^2 = 7`

D

`x^2 +y^2 = 16`

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