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

फलन \(f(x)=x^x, x>0\) .......... अंतराल में निरंतर वर्धमान है।

  1. A  \(\left(0, \frac{1}{\mathrm{e}}\right]\)
  2. B  \(\left[\frac{1}{\mathrm{e}^2}, 1\right)\)
  3. C  \((0, \infty)\)
  4. D  \(\left[\frac{1}{\mathrm{e}}, \infty\right)\)
Verified Solution

Answer & Solution

Correct Answer

(D)  \(\left[\frac{1}{\mathrm{e}}, \infty\right)\)

Step-by-step Solution

Detailed explanation

\( f(x)=x^x ; x>0 \) \( \ell n y=x \ell n x \) \( \frac{1}{y} \frac{d y}{d x}=\frac{x}{x}+\ell n x \) \( \frac{d y}{d x}=x^x(1+\ell n x) \) for strictly increasing \( \frac{d y}{d x} \geq 0 \Rightarrow x^x(1+\ell n x) \geq 0 \) \( \Rightarrow \ell n x \geq-1 \)…
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