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If Y = Sin (Log X), Prove that X 2 D 2 Y D X 2 + X D Y D X + Y = 0 ? - Mathematics

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प्रश्न

If y = sin (log x), prove that \[x^2 \frac{d^2 y}{d x^2} + x\frac{dy}{dx} + y = 0\] ?

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उत्तर

Here,

\[y = \sin\left( \log x \right)\]

\[\text { Differentiating w . r . t . x, we get }\]

\[\frac{d y}{d x} = \frac{\cos\left( \log x \right)}{x}\]

\[\text { Differentiating again w . r . t . x, we get }\]

\[\frac{d^2 y}{d x^2} = \frac{- \sin\left( \log x \right) - \cos\left( \log x \right)}{x^2}\]

\[ \Rightarrow \frac{d^2 y}{d x^2} = \frac{- \sin\left( \log x \right)}{x^2} - \frac{\cos\left( \log x \right)}{x^2}\]

\[ \Rightarrow \frac{d^2 y}{d x^2} = \frac{- y}{x^2} - \frac{1}{x} \times \frac{dy}{dx}\]

\[ \Rightarrow x^2 \frac{d^2 y}{d x^2} + x\frac{dy}{dx} + y = 0\]

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अध्याय 12: Higher Order Derivatives - Exercise 12.1 [पृष्ठ १७]

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आरडी शर्मा Mathematics [English] Class 12
अध्याय 12 Higher Order Derivatives
Exercise 12.1 | Q 39 | पृष्ठ १७

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