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

एक फलन \(y=f(x)\) के लिए \(f(x) \sin 2 x+\sin x-\left(1+\cos ^2 x\right) f^{\prime}(x)=0\) तथा \(\mathrm{f}(0)=0\) है। तो \(\mathrm{f}\left(\frac{\pi}{2}\right)\) = ...........

  1. A \(1\)
  2. B \(0\)
  3. C \(-1\)
  4. D \(2\)
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Answer & Solution

Correct Answer

(A) \(1\)

Step-by-step Solution

Detailed explanation

\( \frac{d y}{d x}-\left(\frac{\sin 2 x}{1+\cos ^2 x}\right) y=\left(\frac{\sin x}{1+\cos ^2 x}\right) \) \( \text { I.F. }=1+\cos ^2 x \) \( y \cdot\left(1+\cos ^2 x\right)=\int(\sin x) d x \) \( =-\cos x+C \) \( x=0, C=1 \) \( y\left(\frac{\pi}{2}\right)=1\)
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