Find the modulus of $\frac{1+i}{1-i}-\frac{1-i}{1+i}$.

Numerical value of the expression $\left| \frac{3x^3 + 1}{2x^2 + 2} \right|$ for $x = -3$ is

If $Z = \frac{(\sqrt{3} + i)^{3}(3i + 4)^{2}}{(8 + 6i)^{2}}$,then $|Z|$ is equal to

If $\left|z+\frac{2}{z}\right|=2$,then the maximum value of $|z|$ is

If $z$ is a complex number such that $z = -\overline{z}$,then $z$:

If $z_1, z_2$ are two complex numbers satisfying $\left|\frac{z_1-3 z_2}{3-z_1 \bar{z}_2}\right|=1$ and $\left|z_1\right| \neq 3$,then $\left|z_2\right|$ is equal to