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

माना अवकल समीकरण \(( y +1) \tan ^{2} x d x +\tan x d y\) \(+ ydx =0, x \in\left(0, \frac{\pi}{2}\right)\) का हल \(y = y ( x )\) है । यदि \(\lim _{ x \rightarrow 0_{+}} xy ( x )=1\), है, तो \(y \left(\frac{\pi}{4}\right)\) का मान हैं

  1. A \(-\frac{\pi}{4}\)
  2. B \(\frac{\pi}{4}-1\)
  3. C \(\frac{\pi}{4}+1\)
  4. D \(\frac{\pi}{4}\)
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Answer & Solution

Correct Answer

(D) \(\frac{\pi}{4}\)

Step-by-step Solution

Detailed explanation

\((y+1) \tan ^{2} x \,d x+\tan x\, d y+y \,d x=0\) \(\frac{d y}{d x}+\frac{\sec ^{2} x}{\tan x} \cdot y=-\tan x\) \(\mathrm{IF}=\mathrm{e}^{\int \frac{\sec ^{2} x}{\tan \mathrm{x}} \mathrm{dx}}=\mathrm{e}^{\operatorname{lntan} \mathrm{x}}=\tan \mathrm{x}\)…
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