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

વિધેય \(f(x)=\left(\frac{2}{x}\right)^{x^{2}}, x>0\) ની સ્થાનીય મહતમ કિમંત મેળવો.

  1. A \((2 \sqrt{\mathrm{e}})^{\frac{1}{\mathrm{e}}}\)
  2. B \(\left(\frac{4}{\sqrt{\mathrm{e}}}\right)^{\frac{\mathrm{e}}{4}}\)
  3. C \((\mathrm{e})^{\frac{2}{\mathrm{e}}}\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(C) \((\mathrm{e})^{\frac{2}{\mathrm{e}}}\)

Step-by-step Solution

Detailed explanation

\(f(x)=\left(\frac{2}{x}\right)^{x^{2}} ; x>0\) \(\ell n f(x)=x^{2}(\ell \ln 2-\ell n x)\) \(f^{\prime}(x)=f(x)\{-x+(\ell n 2-\ell n x) 2 x\}\) \(f^{\prime}(x)=\underbrace{f(x)}_{+} \cdot \underbrace{x}_{+} \underbrace{(2 \ell n 2-2 \ell n x-1)}_{g(x)}\)…
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