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JEE Mains · Maths · STD 12 - 7.2 definite integral

माना \(f : R \rightarrow R\) एक अवकलनीय फलन इस प्रकार है कि \(f \left(\frac{\pi}{4}\right)=\sqrt{2}, f \left(\frac{\pi}{2}\right)=0\) तथा \(f ^{\prime}\left(\frac{\pi}{2}\right)=1\) तथा माना \(x \in\left[\frac{\pi}{4}, \frac{\pi}{2}\right)\) के लिये \(g(x)=\int_x^{\pi / 4}\left(f^{\prime}(t) \sec t+\tan t \sec t f(t)\right) d t\) है। तब \(\lim _{ x \rightarrow\left(\frac{\pi}{2}\right)^{-}} g ( x )\) बराबर है

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

Answer & Solution

Correct Answer

(B) \(3\)

Step-by-step Solution

Detailed explanation

\(g(x)=\int\limits_{x}^{\pi / 4}\left(f^{\prime}(t) \sec t+\tan t \sec t f(t)\right) d t\) \(g(x)=\int\limits_{x}^{\pi / 4} d ( f ( t ) \cdot \sec t )=\left. f ( t ) \operatorname{sect}\right|_{ x } ^{\pi / 4}\)…
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