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

જો \(\left( {2 + \sin x} \right)\frac{{dy}}{{dx}} + \left( {y + 1} \right)\cos x = 0\) અને \(y\left( 0 \right) = 1\) તો \(y\left( {\frac{\pi }{2}} \right) = \) . . . . છે.

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

Answer & Solution

Correct Answer

(B) \(\frac{1}{3}\)

Step-by-step Solution

Detailed explanation

We have \((2+\sin x) \frac{d y}{d x}+(y+1) \cos x=0\) \(\Rightarrow \frac{d}{d x}(2+\sin x)(y+1)=0\) On integrating, we get \((2+\sin x)(y+1)=C\) At \(x=0, y=1\) we have \((2+\sin 0)(1+1)=\mathrm{C}\) \(\Rightarrow \mathrm{C}=4\)…
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