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If the relation f'(a+b) =f'( a)+ f '(b) ...

If the relation f'(a+b) =f'( a)+ f '(b) and ` (d)/(dx)(f(x))=f'(x) `,then f(x) =

A

` x^(4)`

B

`x^(2) `

C

` x^(3)`

D

x

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The correct Answer is:
C
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