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The equation x^(2) + y^(2) - 2xy -1 =0 ...

The equation ` x^(2) + y^(2) - 2xy -1 =0 ` represents :

A

two parallel straight lines

B

two perpendicular straight lines

C

a point

D

a circle

Text Solution

Verified by Experts

The correct Answer is:
A
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