Let f:(0,oo)to R and F(x)=int(0)^(x) f(t...

Let `f:(0,oo)to R and F(x)=int_(0)^(x) f(t)dt. " If " F(x^(2))=x^(2)(1+x)`, then f(4) equals

A

`5//4`

B

7

C

4

D

2

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The correct Answer is:

C

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