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At a point A(1, 1) on ellipse equation o...

At a point `A(1, 1)` on ellipse equation of tangent is `y = x`. If one of the foci of ellipse is `(0,-2)` and the co-ordinates of centre of ellipse are `(alpha,beta)`, then the value of `alpha+ beta` is (Given length of major axis of ellipse is `4sqrt(10) units`)

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