Let f: (0, infty) rarr R and F (x) = in...

Let `f: (0, infty) rarr R and F (x) = int_(0) ^(x) f(t) dt . If F(x^(2))=x^(2)(1+x),` then f (4) is equal to

A

`5//4`

B

7

C

4

D

2

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The correct Answer is:

C

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