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The condition that the chord of the elli...

The condition that the chord of the ellipse `x^2//a^2 + y^2//b^2 = 1`, whose middle point is `(x_1,y_1)` subtends a right angle at the centre of the ellipse is .......... .

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The correct Answer is:
`(x_1^2)/(a^4) + (b_1^2)/(b^4) = ((x_1^2)/(a^2) + (y_1^2)/(b^2)) (1/(a^2) + 1/(b^2))`
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