$ 4xy $ is
[MP PET 1992]
A) $ y^{2}-x^{2}=0 $
B) $ xy=0 $
C) $ x^{2}+y^{2}=2xy $
D) $ \frac{x^{2}-y^{2}}{\sqrt{3}}=\frac{xy}{2} $
Correct Answer: A
$ \frac{x^{2}-y^{2}}{\sqrt{3}-\sqrt{3}}=\text{undefined}\Rightarrow x^{2}-y^{2}=0 $
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