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State true or false for the following : The argument of the complex number $\;z=(1+ i\sqrt{3})(1+i)(cos \theta + i sin \theta)\;$ is $\; \large\frac{7 \pi}{12} + \theta$


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Answer : True
Explanation :
True , because
$\;arg(z)=arg(1+ i\sqrt{3})+ arg(1+i) +arg(cos \theta + i sin \theta)\;$
$\large\frac{\pi}{3}+ \large\frac{\pi}{4} + \theta = \; \large\frac{7 \pi}{12} + \theta$
answered Apr 18, 2014 by yamini.v

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