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The centre of the ellipse (x+y-2)^(2)/9+...

The centre of the ellipse `(x+y-2)^(2)/9+(x-y)^(2)/16=1` is

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The correct Answer is:
(1,1) Length of LR=`(9 sqrt(2))/(4)` directrix `x-y+-(16)/(sqrt(7))=0`
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