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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 center of ellipse are (a, b) then the value of a + b is (Given length of major axis of ellipse is 4√10 units) Correct Answer: 6 Please explain

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 center of ellipse are (a, b) then the value of a + b is (Given length of major axis of ellipse is 4√10 units)
Correct Answer: 6
Please explain

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Grade:12

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