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

यदि \(x =3 \tan t\) तथा \(y =3 \sec t\) है, तो \(t =\frac{\pi}{4}\) पर \(\frac{ d ^{2} y }{ dx ^{2}}\) का मान है

  1. A \(\frac{3}{{2\sqrt 2 }}\)
  2. B \(\frac{1}{{3\sqrt 2 }}\)
  3. C \(\frac {1}{6}\)
  4. D \(\frac{1}{{6\sqrt 2 }}\)
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Answer & Solution

Correct Answer

(D) \(\frac{1}{{6\sqrt 2 }}\)

Step-by-step Solution

Detailed explanation

\(\frac{{dx}}{{dt}} = 3{\sec ^2}t\) \(\frac{{dy}}{{dt}} = 3\sec t\,\tan t\) \(\frac{{dy}}{{dx}} = \frac{{\tan t}}{{\sec t}} = \sin t\) \(\frac{{{d^2}y}}{{d{x^2}}} = \cos \,t\frac{{dt}}{{dx}}\)…
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