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JEE Mains · Maths · STD 12 - 5. continuity and differentiation

यदि \(x =2 \sin \theta-\sin 2 \theta\) तथा \(y =2 \cos \theta-\cos 2 \theta\), \(\theta \in[0,2 \pi]\) हैं, तो \(\theta=\pi\) पर \(\frac{ d ^{2} y }{ dx ^{2}}\) का मान है 

  1. A \(\frac{3}{2}\)
  2. B \(-\frac{3}{4}\)
  3. C \(\frac{3}{4}\)
  4. D \(\frac{3}{8}\)
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Answer & Solution

Correct Answer

(D) \(\frac{3}{8}\)

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Detailed explanation

\(x=2 \sin \theta-\sin 2 \theta\) \(\Rightarrow \frac{d x}{d \theta}=2 \cos \theta-2 \cos 2 \theta=4 \sin \left(\frac{\theta}{2}\right) \sin \left(\frac{3 \theta}{2}\right)\) \(y=2 \cos \theta-\cos 2 \theta\)…
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