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If x^2/a +y^2/b=1 and x^2/c+y^2/d=1 are ...

If `x^2/a +y^2/b=1` and `x^2/c+y^2/d=1` are orthogonal then relation between a , b , c , d is

A

`a+b=c+d`

B

`a-b=c-d`

C

`a+d=c+b`

D

`a-d=c-b`

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