In my AP calc class, my teacher told me to find the f'(x), then f''(x), then\nf'''(x), and so on. I would know how to do f'(x), but after that, I'm\nmysted.\n\nwith all the axn(n-1)(n-1)(n-1)^(n-n), whatever, he told me the answer to\nthat would be (e.g.) 5!\n\nNow I never heard of a number with a ! symbol after it. Can anyone explain\nor link me to somewhere?