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