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JEE Mains · Maths · STD 11 - 4.1 complex nubers

माना \(\mathrm{z}\) एक सम्मिश्र संख्या इस प्रकार है कि \(|\mathrm{z}+2|=1\) और \(\operatorname{Im}\left(\frac{z+1}{z+2}\right)=\frac{1}{5}\)। तो \(|\operatorname{Re}(\overline{z+2})|\) का मान ........... है।

  1. A  \(\frac{\sqrt{6}}{5}\)
  2. B \(\frac{1+\sqrt{6}}{5}\)
  3. C \(\frac{24}{5}\)
  4. D \(\frac{2 \sqrt{6}}{5}\)
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Answer & Solution

Correct Answer

(D) \(\frac{2 \sqrt{6}}{5}\)

Step-by-step Solution

Detailed explanation

\( |z+2|=1, \operatorname{Im}\left(\frac{z+1}{z+2}\right)=\frac{1}{5} \) \( \text { Let } z+2=\cos \theta+i \sin \theta \) \( \frac{1}{z+2}=\cos \theta-i \sin \theta \) \( \Rightarrow \frac{z+1}{z+2}=1-\frac{1}{z+2}=1-(\cos \theta-i \sin \theta) \)…
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