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If $\bar{z}$ is the conjugate of the complex number $z$,then which of the following relations is false?

If $z_1 = 1+2i$ and $z_2 = 3+5i$,then $\text{Re} \left( \frac{\bar{z}_2 z_1}{z_2} \right) = $

Let ${z_1}$ be a complex number with $|{z_1}| = 1$ and ${z_2}$ be any complex number,then $\left| \frac{{z_1 - z_2}}{{1 - z_1 \bar{z}_2}} \right| = $

If $z = \frac{1}{1 - \cos \theta + i \sin \theta}$ and $\theta$ is acute,then the modulus and amplitude of $z$ respectively are:

The modulus of the square root of the complex number $6+8i$ (where $i=\sqrt{-1}$) is

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