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Straight line Ax+By+D=0 would be tangent...

Straight line `Ax+By+D=0` would be tangent to `xy=c^2`, if

A

`A gt 0 , B gt 0 `

B

`A lt 0, B lt 0 `

C

`A gt 0, B lt 0 `

D

`A lt 0, B gt 0 `

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The correct Answer is:
A, B
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