A) \[\frac{{{x}^{2}}}{{{a}^{4}}}+\frac{{{y}^{2}}}{{{b}^{4}}}=\frac{1}{{{a}^{2}}}+\frac{1}{{{b}^{2}}}\]
B) \[\frac{{{x}^{2}}}{{{a}^{4}}}+\frac{{{y}^{2}}}{{{b}^{4}}}={{\left( \frac{1}{{{a}^{{}}}}+\frac{1}{b} \right)}^{2}}\]
C) \[{{a}^{2}}{{x}^{2}}+{{b}^{2}}{{y}^{2}}{{({{a}^{2}}+{{b}^{2}})}^{2}}\]
D) \[{{x}^{2}}+{{y}^{2}}={{a}^{2}}+{{b}^{2}}\]
Correct Answer: A
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