On 16-11-2009 14:15, Invisible wrote:
> Fredrik Eriksson wrote:
> 
>> Basic high-school level math. I am slightly surprised that you did not 
>> know it, though I am not in the least surprised that you did not 
>> bother to google for it.
> 
> ...what I *should* have done of course is
> 
> http://www.wolframalpha.com/input/?i=derivative+f(f(x))
> 
> *facepalm*

no, because that is a derivative with respect to f not x.
your answer might be 
http://www.wolframalpha.com/input/?i=derivative+f%20f%20x%20with%20respect%20to%20x
but then again it might not, depending on what you really want.

Many of my students are (hopefully: were) unable to perform a long 
division or even a long multiplication. They weren't though at school 
because 'everybody has a calculator at hand anyway'.

Someday in the near future all the rest of mathematics and calculus will 
not be though anymore because 'everybody has an internet connection at 
hand anyway'. That will be a sad day for our culture.

Post a reply to this message