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

माना अवकल समीकरण \(\frac{ dy }{ dx }=2( y +2 \sin x -5)\) \(x -2 \cos x\) का हल \(y = y ( x )\) है, जिसके लिए \(y (0)=7\) है। तो \(y (\pi)\) बराबर है

  1. A \(2 \mathrm{e}^{\pi^{2}}+5\)
  2. B \(\mathrm{e}^{\pi^{2}}+5\)
  3. C \(3 \mathrm{e}^{\pi^{2}}+5\)
  4. D \(7 \mathrm{e}^{\pi^{2}}+5\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(2 \mathrm{e}^{\pi^{2}}+5\)

Step-by-step Solution

Detailed explanation

\(\frac{d y}{d x}-2 x y=2(2 \sin x-5) x-2 \cos x\) \(I F=e^{-x^{2}}\) \(\text { so, } y \cdot e^{-x^{2}}=\int e^{-x^{2}}(2 x(2 \sin x-5)-2 \cos x) d x\) \(\Rightarrow y \cdot e^{-x^{2}}=e^{-x^{2}}(5-2 \sin x)+c\) \(\Rightarrow y=5-2 \sin x+c \cdot e^{x^{2}}\) Given at…
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