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

ધારોકે વિકલ સમીકરણ \(\frac{\mathrm{d} y}{\mathrm{~d} x}-y=1+4 \sin x\) નો ઉકેલ \(y=y(x)\) એ \(y(\pi)=1\) નું સમાધાન કરે છે. તો \(y\left(\frac{\pi}{2}\right)+10=\) ...........

  1. A \(10\)
  2. B \(8\)
  3. C \(7\)
  4. D \(5\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(7\)

Step-by-step Solution

Detailed explanation

\( y e^{-x}=\int\left(e^{-x}+4 e^{-x} \sin x\right) d x \) \( y e^{-x}=-e^{-x}-2\left(e^{-x} \sin x e^{-x} \cos x\right)+C \) \( y=-1-2(\sin x+\cos x)+c e^x \) \( \because y(\pi)=1 \Rightarrow c=0 \) \( y(\pi / 2)=-1-2=-3 \) \( \text { Ans }=10-3=7\)
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