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JEE Mains · Maths · STD 12 - 7.1 indefinite integral

समाकल \(\int \sqrt{1+2 \cot x(\operatorname{cosec} x+\cot x)} d x,\) \(\left(0<x<\frac{\pi}{2}\right)\) बराबर है ( जहाँ \(C\) एक समाकलन अचर है)

  1. A \(2\,\log \,\left| {\sin \frac{x}{2}} \right| + C\)
  2. B \(4\,\log \,\left| {\sin \frac{x}{2}} \right| + C\)
  3. C \(2\,\log \,\left| {\cos \frac{x}{2}} \right| + C\)
  4. D \(4\,\log \,\left| {\cos \frac{x}{2}} \right| + C\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(2\,\log \,\left| {\sin \frac{x}{2}} \right| + C\)

Step-by-step Solution

Detailed explanation

Let, \(I=\) \(\int {\sqrt {1 + 2\cot x\csc ecx + 2{{\cot }^2}x} } \cdot dx\) \( \Rightarrow \quad I = \int {\sqrt {\frac{{{{\sin }^2}x + 2\cos x + 2{{\cos }^2}x}}{{{{\sin }^2}x}}} } \cdot dx\) \(\Rightarrow 1=\int \frac{\sqrt{1}+2 \cos x+\cos ^{2} x}{\sin x} \cdot d x\)…
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