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JEE Mains · Maths · STD 12 - 7.2 definite integral

माना किसी फलन \(\mathrm{y}=f(x)\) के लिए, \(\int_0^x t f(t) d t=x^2 f(x), x\gt0\) तथा \(f(2)=3\) है। तो \(f(6)\) = ___

  1. A 1
  2. B 3
  3. C 6
  4. D 2
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(A) 1

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\begin{aligned} & \int_0^x t f(t) d t=x^2 f(x) \\ & \Rightarrow \quad x f(x)=2 x f(x)+x^2 f^{\prime}(x) \\ & \Rightarrow x^2 \cdot f^{\prime}(x)=-x f(x) \\ & \Rightarrow \quad \frac{f^{\prime}(x)}{f(x)}=-\frac{1}{x} \\ & \\ & \quad \int \frac{f^{\prime}(x)}{f(x) d x}=-\int…

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