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What is the modulus of the complex number $(1+2i)(-2+i)$?

If $a = \cos \theta + i \sin \theta$,then $\frac{1 + a}{1 - a} = $

The product of two complex numbers,each of unit modulus,is also a complex number of:

If ${z_1}, {z_2}, {z_3}$ are complex numbers such that $|{z_1}| = |{z_2}| = |{z_3}| = \left| \frac{1}{z_1} + \frac{1}{z_2} + \frac{1}{z_3} \right| = 1$,then $|{z_1} + {z_2} + {z_3}|$ is

If $|z_1| = |z_2| = \dots = |z_n| = 1$,then the value of $|z_1 + z_2 + z_3 + \dots + z_n|$ is equal to:

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