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JEE Mains · Maths · STD 12 - 9. differential equations

माना एक अवकलनीय फलन \(\mathrm{f}\), \(\mathrm{f}(\mathrm{x})+\int_3^{\mathrm{x}} \frac{\mathrm{f}(\mathrm{t})}{\mathrm{t}} \mathrm{dt}=\sqrt{\mathrm{x}+1}, \mathrm{x} \geq 3\) को संतुष्ट करता है। तो \(12 \mathrm{f}(8)\) बराबर है:

  1. A \(34\)
  2. B \(19\)
  3. C \(17\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(17\)

Step-by-step Solution

Detailed explanation

Differentiate w.r.t. x \(f^{\prime}(x)+\frac{f(x)}{x}=\frac{1}{2 \sqrt{x+1}}\) \(\text { I.F. }=e^{\int \frac{1}{x} d x}=e^{\ln x}=x\) \(x f(x)=\int \frac{x}{2 \sqrt{x+1}} d x\) \(x+1=t^2\) \(=\int \frac{t^2-1}{2 t} 2 t d t\) \(x f(x)=\frac{t^3}{3}-t+c\)…
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