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