If $-1 + \sqrt{-3} = r e^{i\theta}$, then the value of $\theta$ is

There are $5$ boys and $3$ girls seated in a row for a photograph. The number of ways in which a photograph can be taken if the girls occupy only odd places is...

The value of the expression $\tan(x - 9\pi)$ is equal to:

The principal solutions of $\text{cosec}(\theta) = -2$ are...