The auxiliary circle of the ellipse x^(...

The auxiliary circle of the ellipse ` x^(2)/25 + y^(2)/16 = 1 `

`x^(2) + y^(2) =25`

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

`x^(2) + y^(2) = 41`

`x^(2) + y^(2) = 5`

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