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

यदि \(\frac{ dy }{ dx }=\frac{ xy }{ x ^{2}+ y ^{2}} ; y (1)=1\) है, तो \(y ( x )= e\) को सन्तुष्ट करने वाला \(x\) का एक मान है 

  1. A \(\sqrt{2} \mathrm{e}\)
  2. B \(\frac{e}{\sqrt{2}}\)
  3. C \(\frac{1}{2} \sqrt{3} \mathrm{e}\)
  4. D \(\sqrt{3} \mathrm{e}\)
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Answer & Solution

Correct Answer

(D) \(\sqrt{3} \mathrm{e}\)

Step-by-step Solution

Detailed explanation

\(\frac{d y}{d x}=\frac{x y}{x^{2}+y^{2}}\) Let \(\mathrm{y}=\mathrm{vx}\) \(\frac{\mathrm{dy}}{\mathrm{dx}}=\mathrm{v}+\mathrm{x} \cdot \frac{\mathrm{dv}}{\mathrm{dx}}\)…
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