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If a^2-b^2-c^2-2ab=0, then the family of...

If `a^2-b^2-c^2-2ab=0`, then the family of lines ax+by+c=0 are concurrent at the points

A

(1,-1)

B

(-1,1)

C

(1,1)

D

(-1,-1)

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The correct Answer is:
B, C
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