anonymous
  • anonymous
find the derivative of f(x) = 3x cos 6x .
Mathematics
chestercat
  • chestercat
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Mimi_x3
  • Mimi_x3
\[\frac{d}{dx}3xcos6x\] Do you know the product rule?
anonymous
  • anonymous
yes
Mimi_x3
  • Mimi_x3
So, what have you done?

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anonymous
  • anonymous
but how would i use it in this case
Mimi_x3
  • Mimi_x3
Where are you having problems?
anonymous
  • anonymous
may someone please show me step by step how to do this. my professor sucks and is currently being investigated by the math dept here because of it so yeah...
anonymous
  • anonymous
Here is a great site to help you with your math! www. mathway.com! :)
anonymous
  • anonymous
That site will provide you with a step by step! :D
anonymous
  • anonymous
mathway is not credible
Mimi_x3
  • Mimi_x3
Well, have you atleast tried it?
anonymous
  • anonymous
How i learn a lot from that site...
anonymous
  • anonymous
You just have to sign up to get the step by step part!! :) It helps me a ton...
anonymous
  • anonymous
i have missed many questions from its wrong answers. wolframalpha is more reliable
anonymous
  • anonymous
Okay. maybe you just type them in wrong... it always helps me :D
anonymous
  • anonymous
I dont use it for tests though... i use it for help... you use it for tests?
anonymous
  • anonymous
okay sure but anyways thanks bye. now back to the question i need help with
Mimi_x3
  • Mimi_x3
@tinagca: Please don't divert people to another site; when someone is trying to help them.
anonymous
  • anonymous
Mkay! later :D
anonymous
  • anonymous
I was trying to give her a step by step site :o
Mimi_x3
  • Mimi_x3
That was retarded; interjecting out of the blue.
anonymous
  • anonymous
please folks i really need help the bantering can be spared
anonymous
  • anonymous
Oh shut up. like seriously i was trying to help then you guys started being rude. So whatever, a simple thank you and just saying " Oh i already tried that site" would have been fine.
zepdrix
  • zepdrix
|dw:1350314820570:dw|
anonymous
  • anonymous
thank you zepdrix u are always so helpful
zepdrix
  • zepdrix
so do it piece by piece :) We have a (3x)', what is the derivative of 3x? :D
anonymous
  • anonymous
simply 3
zepdrix
  • zepdrix
ok cool, so the first term will simplify to (3)(cos6x). Hmm now we have a (cos6x)' on the right side. We'll take the derivative of the outermost function (cosine) Then "chain" (multiply by the derivative of the inside (6x)' ) So whats the derivative of cos6x? :D
anonymous
  • anonymous
-6sin(6x)
anonymous
  • anonymous
right
zepdrix
  • zepdrix
Yay sandy \c:/
anonymous
  • anonymous
You should give @zepdrix a medal @sandy524 ...i mean, that was a great answer!
zepdrix
  • zepdrix
lol tina c:
anonymous
  • anonymous
:) I gave you a medal! :D
anonymous
  • anonymous
ok so after that what do we do
zepdrix
  • zepdrix
Just combine the pieces together and simplify :D So far we've figured out that the derivative is (3)(cos6x) + (3x)(-6sin6x) =3cos6x -18xsin6x Make sense? :D

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