Let f:[0, ) R and F(x)= _ 0 ^ x f(t) d t . If F [ x ^ 2 ]= x ^ 2 [1+ x ] , then f(4)…

Mathematics · JEE Main · NTA ExamsIntegral Calculus

Let \(f:[0, \infty) \rightarrow R\) and \(F(x)=\int_{0}^{x} f(t) d t\). If \(F\left[\mathbf{x}^{2}\right]=\mathbf{x}^{2}[1+\mathbf{x}]\), then \(f(4)\) equals
  1. \(\frac{5}{7}\)
  2. 7
  3. 4
  4. 2

Answer

(D) 2

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