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

यदि अवकल समीकरण \(y ^2 dx +\left( x ^2- xy + y ^2\right) dy\) \(=0\) का हल वक्र \(y = y ( x )\) है, तो बिन्दु \((1,1)\) से गुजरता है तथा सरल रेखा \(y =\sqrt{3} x\) को बिन्दु \((\alpha, \sqrt{3} \alpha)\) पर प्रतिच्छेद करता है तो \(\log _e(\sqrt{3}\alpha\) ) का मान होगा

  1. A \(\frac{\pi}{3}\)
  2. B \(\frac{\pi}{2}\)
  3. C \(\frac{\pi}{12}\)
  4. D \(\frac{\pi}{6}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{\pi}{12}\)

Step-by-step Solution

Detailed explanation

\(y^{2} d x-x y d y=-\left(x^{2}+y^{2}\right) d y\) \(y(y d x-x d y)=-\left(x^{2}+y^{2}\right) d y\) \(-y(x d x-y d x)=-\left(x^{2}+y^{2}\right) d y\) \(\frac{x d y-y d x}{x^{2}}=\left(1+\frac{y^{2}}{x^{2}}\right) \frac{d y}{y}\)…
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