A) \[ab={{x}^{2}}\]
B) \[\frac{1}{a}+\frac{1}{b}=\frac{1}{x}\]
C) \[{{a}^{2}}+{{b}^{2}}=2{{x}^{3}}\]
D) \[\frac{1}{{{a}^{2}}}+\frac{1}{{{b}^{2}}}=\frac{1}{{{x}^{2}}}\]
E) None of these
Correct Answer: D
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