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JEE Mains · Maths · STD 11 - 4.1 complex nubers

\(z_0\) એ દ્રીઘાત સમીકરણ \(x^2 + x + 1= 0\) નો ઉકેલ છે. જો \(z = 3 + \,6iz_0^{81}\, - 3iz_0^{93}\) હોય તો arg \(z\) મેળવો. 

  1. A \(\frac {\pi }{4}\)
  2. B \(\frac {\pi }{3}\)
  3. C \(0\)
  4. D \(\frac {\pi }{6}\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(\frac {\pi }{4}\)

Step-by-step Solution

Detailed explanation

\(z_{0}=\omega\) or \(\omega^{2}\) (where \(\omega\) is a non - real cube root of unity) \(z=3+6 i(\omega)^{81}-3 i(\omega)^{93}\) \(z=3+3 i\) \(\Rightarrow \arg z=\frac{\pi}{4}\)
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