Deriving ln[x^n]

So the mathbook says:
f(x) = ln[x^n]
f'(x) = n/x
but it doesn't give an explanation to why. Please do tell me as the website of my distance education company isn't responding at the moment.

>>4

you'll never be good at maths if you forget essential shit like this. then again your goal might not be to be good at maths, in which case you suck