4-1.Complex numbers
normal

જો $Arg(z)$ એ સંકર સંખ્યા $z$ નો મુખ્ય કોણાક દર્શાવે તો $Arg\left( { - i{e^{i\frac{\pi }{9}}}.{z^2}} \right) + 2Arg\left( {2i{e^{-i\frac{\pi }{{18}}}}.\overline z } \right)$ ની કિમત મેળવો 

A

$0$

B

$\frac{\pi }{2}$

C

$\pi$

D

$Arg$  $z$

Solution

$ \operatorname{Arg}(-1)+\frac{\pi}{9}+2 \operatorname{Arg}(z) $

$ +2\left[\operatorname{Arg}(1)-\frac{\pi}{18}+\operatorname{Arg}(\bar{z})\right] $ 

$=-\frac{\pi}{2}+\frac{\pi}{9}+\pi-\frac{\pi}{9}+2(\operatorname{Arg} z+\operatorname{Arg} \bar{z}) $ 

$= \frac{\pi}{2}+2(0)=\frac{\pi}{2} $

Standard 11
Mathematics

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