A) \[28\,(7\sqrt{3}+13)\,c{{m}^{2}}\]
B) \[28\,(7\sqrt{3}+5)\,c{{m}^{2}}\]
C) \[28\,(7\sqrt{3}-11)\,c{{m}^{2}}\]
D) \[28\,(8\sqrt{3}-13)\,c{{m}^{2}}\]
E) None of these
Correct Answer: C
Solution :
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