Let $z, w$ be distinct complex numbers. Show that if $|z| = 1$ or $|w| = 1$, then
$\frac{|z − w|}{|1 − z^*w|} = 1$
[Hint: Note that $|a|^2 = aa^*$.]
Hey guys, couldn't get my thinking cap on for this question. Any helpful input? Will appreciate it!