Power correct notation Ok, I know this may sound dumb, but I am trying to understand which is the correct (most beauty) notation for the power function ${\rm pow}(f(x),n)$.
This is the correct one: $[f(x)]^n$
From trigonometry, where I was used to write $\cos^2x$, we get: $f^n(x)$
And from Bishop's Pattern Recognition and Machine Learning I get $\mathbb{E}\,[f(x)^2]$, so: $f(x)^n$
So, is there any other 'me' out there who has already found the correct beauty and elegant way?

The most clear notation is certainly to write $$\left(f(x)\right)^n$$
This is because the notation $f^n(x)$ will frequently refer to the composition $f \circ f \circ ... \circ f$.
