A) \[2a\,\,f\,\,(a)-{{a}^{2}}f'\,\,(a)\]
B) \[2a\,\,f\,\,(a)+{{a}^{2}}f'\,\,(a)\]
C) \[-{{a}^{2}}f'\,\,(a)\]
D) \[a\,\,f\,\,(a)-{{a}^{2}}f'\,\,(a)\]
E) None of these
Correct Answer: A
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