A) \[{{y}^{2}}+xy-{{x}^{2}}=0\]
B) \[{{y}^{2}}-xy+{{x}^{2}}=0\]
C) \[{{x}^{2}}+xy+{{y}^{2}}=0\]
D) \[{{x}^{2}}+xy-2{{y}^{2}}=0\]
Correct Answer: A
Solution :
Here\[a+b=0\].
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