Question
If $\alpha$ and $\beta$ are two different complex numbers with $|\beta| = 1$, then $\left|\frac{\beta - \alpha}{1 - \alpha \beta}\right|$ is equal to
If $\alpha$ and $\beta$ are two different complex numbers with $|\beta| = 1$, then $\left|\frac{\beta - \alpha}{1 - \alpha \beta}\right|$ is equal to