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

वक्र \(y=y(x)\) के किसी भी बिंदु \((x, y)\) पर स्पर्श रेखा की प्रवणता \(\frac{x^2+y^2}{2 x y}, \mathrm{x}>0\) है। यदि \(\mathrm{y}(2)=0\) है, तो \(\mathrm{y}(8)\) का एक मान है

  1. A \(-2 \sqrt{3}\)
  2. B \(4 \sqrt{3}\)
  3. C \(2 \sqrt{3}\)
  4. D \(-4 \sqrt{2}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(4 \sqrt{3}\)

Step-by-step Solution

Detailed explanation

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