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JEE Mains · Maths · STD 12 - 9. differential equations

વિકલ સમીકરણ \(y' = \frac{y}{x} + \phi \left( {\frac{x}{y}} \right)\) નું કોઈ વિધેય \(\phi \) માટે વ્યાપક ઉકેલ \(y \ln \,\left| {cx} \right| = x\) છે કે જ્યાં \(c\) સ્વેર અચળાંક છે તો \(\phi \,(2)\) મેળવો.

  1. A \(4\)
  2. B \(\frac{1}{4}\)
  3. C \(-4\)
  4. D \(-\frac{1}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(-\frac{1}{4}\)

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Detailed explanation

\(\text { Given } \frac{d y}{d x}=\frac{y}{x}+\phi\left(\frac{y}{x}\right)\) ....\((1)\) Let \(\left(\frac{y}{x}\right)=v\) so that \(y=x v\) or \(\frac{d y}{d x}=x \frac{d h}{d x}+y\) ....\((2)\) from \((1)\) and \((2), x \frac{d v}{d x}+v=v+\phi\left(\frac{1}{v}\right)\) or.…
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