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A) \[{{m}^{2}}+{{n}^{2}}=2\]
B) \[{{m}^{2}}+{{n}^{2}}=1\]
C) \[{{m}^{2}}-{{n}^{2}}=1\]
D) \[{{m}^{2}}+{{n}^{2}}=3\]
E) None of these
Correct Answer: A
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