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

मान लीजिए अवकल समीकरण \(xdy-ydx=\sqrt{x^{2}+y^{2}}dx, x>0, y(1)=0\) का हल वक्र \(y=y(x)\) है। तब \(y(3)\) = ___ है।

  1. A 4
  2. B 6
  3. C 1
  4. D 2
Verified Solution

Answer & Solution

Correct Answer

(A) 4

Step-by-step Solution

Detailed explanation

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