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Given an ellipse equation like : (x-1)^2 /4 + y^2/9 = 1.. how do i know which one is a^2 or b^2? is it the four or 9.. please explain why?

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  • Given an ellipse equation like : (x-1)^2 /4 + y^2/9 = 1.. how do i know which one is a^2 or b^2? is it the four or 9.. please explain why?


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