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JEE Mains · Maths · STD 11 - 4.1 complex nubers

જો  \(z\)  એ વાસ્તવિક સંકર સંખ્યા ન હોય તો \(\frac{{\operatorname{l} m{z^5}}}{{{{\left( {lmz} \right)}^5}}}\) ની ન્યૂનતમ કિમત મેળવો.

  1. A \(-1\)
  2. B \(-4\)
  3. C \(-2\)
  4. D \(-5\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(-4\)

Step-by-step Solution

Detailed explanation

Let \(z=r e^{i \theta}\) Consider \(\frac{{\operatorname{Im} {z^5}}}{{{{(\operatorname{lm} z)}^5}}} \) \(= \,\frac{{{r^5}\,(\sin 5\theta )}}{{{r^5}\,{{(\sin \theta )}^5}}}\) \(\left(\because e^{i \theta}=\cos \theta+i \sin \theta\right)\)…
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