a(x^(2)-y^(2))+xy=0 represents a pair of...

`a(x^(2)-y^(2))+xy=0` represents a pair of straight lines for

A

(a) `a=1` only

B

`(b) a=1` or `-1` only

C

(c) `a=0` only

D

(d) all real values of a.

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The correct Answer is:

D

NA

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