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

यदि अवकल समीकरण \(x \cos \left(\frac{y}{x}\right) \frac{d y}{d x}=y \cos \left(\frac{y}{x}\right)+x\) तथा \(y(1)=\frac{\pi}{3}\), का हल \(\sin \left(\frac{\mathrm{y}}{\mathrm{x}}\right)=\log _{\mathrm{e}}|\mathrm{x}|+\frac{\alpha}{2}\) है, तो \(\alpha^2\) = ...........

  1. A \(3\)
  2. B \(12\)
  3. C \(4\)
  4. D \(9\)
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Answer & Solution

Correct Answer

(A) \(3\)

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Detailed explanation

Differential equation :- \( x \cos \frac{y}{x} \frac{d y}{d x}=y \cos \frac{y}{x}+x \) \( \cos \frac{y}{x}\left[x \frac{d y}{d x}-y\right]=x\) Divide both sides by \(\mathrm{x}^2\) \(\cos \frac{y}{x}\left(\frac{x \frac{d y}{d x}-y}{x^2}\right)=\frac{1}{x}\) Let \(\frac{y}{x}=t\)…
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