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The equation (x^(2)+y^(2))(h^(2)+k^(2)-a...

The equation `(x^(2)+y^(2))(h^(2)+k^(2)-a^(2))=(hx+ky)^(2)` represents a pair of perpendicular lines if

A

`h^(2)+k^(2)=2a^(2)`

B

`(h+k)(h-k)=2a^(2)`

C

`h^(2)+k^(2)=a^(2)`

D

`h^(2)+k^(2)=0`

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The correct Answer is:
A
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