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A square is inscribed inside the ellipse...

A square is inscribed inside the ellipse`x^2/a^2+y^2/b^2=1`, the length of the side of the square is

A

`(ab)/(sqrt(a^(2)+b^(2)))`

B

`(2ab)/(sqrt(a^(2)+b^(2)))`

C

`sqrt(a^(2)+b^(2))`

D

none of these

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