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​Differentiate ( X X ) √ X ? - Mathematics

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प्रश्न

Differentiate  \[\left( x^x \right) \sqrt{x}\] ?

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उत्तर

\[\text{ Let y } = x^x \sqrt{x} . . . \left( i \right)\]

\[\text{ Taking log on both sides }, \]

\[\log y = \log\left( x^x \sqrt{x} \right)\]

\[ \Rightarrow \log y = \log x^x + \log x^\frac{1}{2} \]

\[ \Rightarrow \log y = x \log x + \frac{1}{2}\log x \]

Differentiating with respect to x,

\[\frac{1}{y}\frac{dy}{dx} = x\frac{d}{dx}\left( \log x \right) + \log x\frac{d}{dx}\left( x \right) + \frac{1}{2}\frac{d}{dx}\left( \log x \right) \]

\[ \Rightarrow \frac{1}{y}\frac{dy}{dx} = x\left( \frac{1}{x} \right) + \log x\left( 1 \right) + \frac{1}{2}\left( \frac{1}{x} \right)\]

\[ \Rightarrow \frac{1}{y}\frac{dy}{dx} = 1 + \log x + \frac{1}{2x}\]

\[ \Rightarrow \frac{dy}{dx} = y\left[ 1 + \log x + \frac{1}{2x} \right]\]

\[ \Rightarrow \frac{dy}{dx} = x^x \sqrt{x}\left[ 1 + \log x + \frac{1}{2x} \right] \left[ \text{ using equation} \left( i \right) \right]\]

\[ \Rightarrow \frac{dy}{dx} = x^{x + \frac{1}{2}} \left[ \left( \frac{2x + 1}{2x} \right) + \log x \right]\]

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पाठ 11: Differentiation - Exercise 11.05 [पृष्ठ ८८]

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आरडी शर्मा Mathematics [English] Class 12
पाठ 11 Differentiation
Exercise 11.05 | Q 18.1 | पृष्ठ ८८

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