hey, trying to do a question, but don't know how to differentiate factorials, how would u differentiate (x-2)! any help would be great thanks

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- April 28th 2008, 04:35 PMmrQwertyFactorials
hey, trying to do a question, but don't know how to differentiate factorials, how would u differentiate (x-2)! any help would be great thanks

- April 28th 2008, 06:13 PMTheEmptySet
- April 28th 2008, 07:59 PMmrQwerty
im trying to find the derivative of cos x using the series

i worked out that each term could be given by

although now that i think about it, thats not going to help is it.

would it be possible just to differentiate each term ie becomes and repeat for each term, how would u state that you are assuming something is continuing though. - April 28th 2008, 08:05 PMMathstud28
- April 28th 2008, 08:24 PMmrQwerty
sorry to be a pain, but ive never seen

also my question asks specifically to use the series to confirm the derivative of cosx is sinx. so im guessing that i have to use the series.

- April 28th 2008, 08:27 PMMathstud28
- April 28th 2008, 08:45 PMmrQwerty
thank you, but how would you be able to help me get from

to the series you showed me.

thanks again your help is really appreciated