A) \[xy={{a}^{2}}\]
B) \[\frac{1}{x}+\frac{1}{y}=\frac{1}{a}\]
C) \[{{x}^{2}}+{{y}^{2}}=2{{a}^{2}}\]
D) \[\frac{1}{{{x}^{2}}}+\frac{1}{{{y}^{2}}}=\frac{1}{{{a}^{2}}}\]
Correct Answer: D
Solution :
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