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

माना \(y = y ( x )\), अवकल समीकरण \(e^{y} \frac{d y}{d x}-2 e^{y} \sin x+\sin x \cos ^{2} x=0, y\left(\frac{\pi}{2}\right)=0\) का हल है। यदि \(y (0)=\log _{ e }\left(\alpha+\beta e ^{-2}\right)\) है, तो \(4(\alpha+\beta)\) बराबर है ....... |

  1. A \(2\)
  2. B \(5\)
  3. C \(4\)
  4. D \(3\)
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Answer & Solution

Correct Answer

(C) \(4\)

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Detailed explanation

\(\text { Let } e^{y}=t\) \(\Rightarrow \frac{d t}{d x}-(2 \sin x) t=-\sin x \cos ^{2} x\) \(\text { I.F. }=e^{2 \cos x}\) \(\Rightarrow t=e^{2 \cos x}=\int e^{2 \cos x}\left(-\sin x \cos ^{2} x\right) d x\)…
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