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JEE Mains · Maths · STD 12 - 7.1 indefinite integral

ધારોકે \(f(t)=\int\left(\frac{1-\sin \left(\log _e t\right)}{1-\cos \left(\log _e t\right)}\right) d t, t>1\).જો \(f\left(e^{\pi / 2}\right)=-e^{\pi / 2}\) અને \(f\left(e^{\pi / 4}\right)=\alpha e^{\pi / 4}\) હોય, તો \(\alpha\) = ___ .

  1. A \(-1-\sqrt{2}\)
  2. B \(-1-2\sqrt{2}\)
  3. C \(1+\sqrt{2}\)
  4. D \(-1+\sqrt{2}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(-1-\sqrt{2}\)

Step-by-step Solution

Detailed explanation

\(f(t)=\int \frac{1-\sin (\ln t)}{1-\cos (\ln t)} d t\) Let \(\ln t=x \Rightarrow t=e^x \Rightarrow d t=e^x d x\) \(=\frac{1}{2} \int\left(\operatorname{cosec}^2 \frac{x}{2}-2 \cot \frac{x}{2}\right) e^x d x-t \cot \left(\frac{\ln t}{2}\right)+C\)…
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