# Last differential question. Trig inside a trig.

• Oct 14th 2007, 07:27 PM
pseizure2000
Last differential question. Trig inside a trig.
f(x) = 9sin(cos(x^6))

I think im supposed to use the chain rule here but not sure how.
• Oct 14th 2007, 07:48 PM
Krizalid
$f(x)=9\sin(\cos x^6)\implies f'(x)=9\cos(\cos x^6)\cdot(\cos x^6)'$

Can you take it from there?
• Oct 14th 2007, 07:53 PM
pseizure2000
yes yes. thank you very much. i really need to study this mess.