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JEE Mains · Maths · STD 11 - 4.1 complex nubers

यदि \(\theta \in(0, \pi)\) के लिए सम्मिश्र संख्या \((1-\cos \theta+2 i \sin \theta)^{-1}\) का वास्तविक भाग \(\frac{1}{5}\) है, तो समाकलन \(\int \limits_{0}^{\theta} \sin xdx\) का मान बराबर है

  1. A \(2\)
  2. B \(-1\)
  3. C \(0\)
  4. D \(1\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(1\)

Step-by-step Solution

Detailed explanation

\(z=\frac{1}{1-\cos \theta+2 i \sin \theta}\) \(=\frac{2 \sin ^{2} \frac{\theta}{2}-2 i \sin \theta}{(1-\cos \theta)^{2}+4 \sin ^{2} \theta}\)…
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