Straight line \( A x+B y+D=0 \) would be tangent to \( x y=c^{2} \), if: (a) \( A0, B0 \) (b) \(...

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Straight line \( A x+B y+D=0 \) would be tangent to \( x y=c^{2} \), if:
(a) \( A0, B0 \)
(b) \( A0, B0 \)
(c) \( A0, B0 \)
(d) \( A0, B0 \)
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