The Student Room Group

confused about something first principles and derivitives

please see attatched
Reply 1
I could guess but it would help if you can tell me what "n" is.

Is there a section of the notes before this that you haven't posted?
Reply 2
Difficult to tell with such scant detail, but I suspect that you have to have to be able to differentiate x^n from first principals for rational n.

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