Front page material? P(max{X_1, X_2} <= x) = P(X_1 <= x, X_2 <= x) = P(X_1 <= x) P(X_2 <= x) = xx. P(sqrt(X_3) <= x) = P(X_3 <= x^2) = x^2.
It is late in the day when midgets cast long shadows.
I felt the same way, came here to decide whether to comment something negative, saw your comment was just posted. But I first read the top comment from 2 hours ago, apparently this is news-ish to stats people because it's counterintuitive to common methods? shrug