A) \[\frac{1}{4}\left( {{m}^{2}}+{{n}^{2}} \right)\]
B) \[\frac{1}{6}\left( {{m}^{2}}+4{{n}^{3}} \right)\]
C) \[{{m}^{2}}+{{n}^{2}}\]
D) \[\frac{1}{8}\left( {{m}^{2}}+4{{n}^{2}} \right)\]
Correct Answer: C
Solution :
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