If $\arg(z) < 0$,then $\arg(-z) - \arg(z)$ is equal to

The argument of the complex number $\sin \frac{6\pi}{5} + i(1 + \cos \frac{6\pi}{5})$ is

The sum of the argument of $z$ and another complex number is $\pi$. The other complex number can be written as:

If ${z_1}$ and ${z_2}$ are two non-zero complex numbers such that $|{z_1} + {z_2}| = |{z_1}| + |{z_2}|,$ then $\text{arg}({z_1}) - \text{arg}({z_2})$ is equal to

The amplitude of $0$ is

Let $z_1$ and $z_2$ be two non-zero complex numbers. Then