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JEE Mains · Maths · STD 12 - 5. continuity and differentiation

अवकलनीय फलन \(\mathrm{f}: \mathbb{R}-\{0\} \rightarrow \mathbb{R}\) के लिए माना \(3 \mathrm{f}(\mathrm{x})+2 \mathrm{f}\left(\frac{1}{\mathrm{x}}\right)=\frac{1}{\mathrm{x}}-10\) है, तो \(\left|f(3)+f^{\prime}\left(\frac{1}{4}\right)\right|\) बराबर है

  1. A \(7\)
  2. B \(\frac{33}{5}\)
  3. C \(\frac{29}{5}\)
  4. D \(13\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(13\)

Step-by-step Solution

Detailed explanation

\({\left[3 f(x)+2 f\left(\frac{1}{x}\right)=\frac{1}{x}-10\right] \times 3}\) \({\left[2 f(x)+3 f\left(\frac{1}{x}\right)=x-10\right] \times 2}\) \(5 f(x)=\frac{3}{x}-2 x-10\) \(f(x)=\frac{1}{5}\left(\frac{3}{x}-2 x-10\right)\)…
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