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

दीर्घवृत्त के उस कुल, जिनकी नाभियाँ या तो \(x\)-अक्ष पर अथवा \(y\)-अक्ष पर हैं, केन्द्र मूल बिंदु पर है तथा जो बिंदु \((0,3)\) से होकर जाती हैं, का अवकल समीकरण है

  1. A \(xyy' + y^2 - 9 = 0\)
  2. B \(x  + yy'' = 0\)
  3. C \(xyy'' + x (y')^2  - yy' = 0\)
  4. D \(xyy' - y^2 + 9 = 0\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(xyy'' + x (y')^2  - yy' = 0\)

Step-by-step Solution

Detailed explanation

\(\frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1\) since. it passes through \((0,3)\) \(\therefore \frac{0}{a^{2}}+\frac{9}{b^{2}}=1\) \(\Rightarrow b^{2}=9\) \(\therefore\) eq. of ellipse becomes: \(\frac{x^{2}}{a^{2}}+\frac{y^{2}}{9}=1\) differential w.r.t. \(x,\) we get;…
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