1. ## Math question

Er... verify something for me guys; Is the derivative of
Code:
`sin(cos(x))`
equal to
Code:
`-cos(cos(x))sin(x)`

2. That's not what I got - I got
sin(-sin(x)) * cos(cos(x))

I could be wrong, though.

3. Where did that extra sine come from?

4. Chain rule.

5. Code:
`f(x) = sin(cos(x))`
Code:
`f'(x) = cos(cos(x)) * (-sin(x)) * (1)`
Right?

6. Um... Maybe. Like I said, I could be (and likely am) wrong...

Heh, 3 years of calc, and I can't remember a damn thing. Thank you, beer!

7. The answer I got from people that are better at this than me was -sin(x) * cos(cos(x)), so the same thing that you got.

Guess it's time to dig out that calc book again.

8. I just want to make sure I am remembering this stuff right so that I don't mess my entire week up as I go back trying to figure out what's wrong only to find it's this stuff

9. Ok thanks Govtcheez!

10. working on... finding... Maple...

ok... I can't locate a free download of it anymore, but it's useful for checking your derivatives/integrals... sorry... you could look around for a copy of it tho.

11. I've never heard of it... does it work well?

12. ONce you figure it out, it's helpful. I never got the hang of it, though.

13. Hmmm... maybe I should write something to calculate derivative expressions like a TI-89 or Maple does

14. yeah, there's definately a learning curve, but when you can type in an equation and it spits out what you want.... you just can't beat it.

15. um... what about my TI-92?