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The equation to the auxiliary circle of...

The equation to the auxiliary circle of `(x^(2))/(7)+(y^(2))/(5)=1` is

A

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

B

`x^(2)+y^(2)=7`

C

`x^(2)+y^(2)=18`

D

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

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The correct Answer is:
B
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