A) \[{{n}^{2}}-{{m}^{2}}\]
B) \[{{m}^{2}}+\text{ }{{n}^{2}}\]
C) \[{{m}^{2}}-{{n}^{2}}\]
D) \[{{\left( m-n \right)}^{2}}\]
E) None of these
Correct Answer: A
Solution :
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