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JEE Mains · Maths · STD 12 - 6. Application of derivatives

माना कि \(g(x)=3 f\left(\frac{x}{3}\right)+f(3-x)\) और \(f^{\prime \prime}(x)>0\) सभी \(\mathrm{x} \in(0,3)\) के लिए। यदि \(\mathrm{g}\) \((0, \alpha)\) में ह्रासमान है और \((\alpha, 3)\) में वर्धमान है, तो \(8 \alpha\) = ...........

  1. A \(24\)
  2. B \(0\)
  3. C \(18\)
  4. D \(20\)
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Answer & Solution

Correct Answer

(C) \(18\)

Step-by-step Solution

Detailed explanation

\(g(x)=3 f\left(\frac{x}{3}\right)+f(3-x) \text { and } f^{\prime \prime}(x) > 0 \forall x \in(0,3)\) \(\Rightarrow \mathrm{f}^{\prime}(\mathrm{x})\) is increasing function \( g^{\prime}(x)=3 \times \frac{1}{3} \cdot f^{\prime}\left(\frac{x}{3}\right)-f^{\prime}(3-x) \)…
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