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

यदि \(\cos x \frac{d y}{d x}-y \sin x=6 x,\left(0 < x < \frac{\pi}{2}\right)\) तथा \(y \left(\frac{\pi}{3}\right)=0\) है, तो \(y \left(\frac{\pi}{6}\right)\) बराबर है 

  1. A \( - \frac{{{\pi ^2}}}{{4\sqrt 3 }}\)
  2. B \( - \frac{{{\pi ^2}}}{2}\)
  3. C \(  \frac{{{\pi ^2}}}{{2\sqrt 3 }}\)
  4. D \( - \frac{{{\pi ^2}}}{{2\sqrt 3 }}\)
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Answer & Solution

Correct Answer

(D) \( - \frac{{{\pi ^2}}}{{2\sqrt 3 }}\)

Step-by-step Solution

Detailed explanation

\(\cos x \frac{d y}{d x}-y \sin x=6 x\) \(\Rightarrow \frac{d y}{d x}-y \tan x=6 x \sec x\) \(=\mathrm{e}^{-\int \tan x d x}=e^{-\log _{e} \sec x}=\frac{1}{\sec x}\) \(\therefore \) solution of equation…
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