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