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sandy524

find the derivative of f(x) = 3x cos 6x .

  • one year ago
  • one year ago

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  1. Mimi_x3
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    \[\frac{d}{dx}3xcos6x\] Do you know the product rule?

    • one year ago
  2. sandy524
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    yes

    • one year ago
  3. Mimi_x3
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    So, what have you done?

    • one year ago
  4. sandy524
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    but how would i use it in this case

    • one year ago
  5. Mimi_x3
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    Where are you having problems?

    • one year ago
  6. sandy524
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    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...

    • one year ago
  7. tinagca
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    Here is a great site to help you with your math! www. mathway.com! :)

    • one year ago
  8. tinagca
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    That site will provide you with a step by step! :D

    • one year ago
  9. sandy524
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    mathway is not credible

    • one year ago
  10. Mimi_x3
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    Well, have you atleast tried it?

    • one year ago
  11. tinagca
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    How i learn a lot from that site...

    • one year ago
  12. tinagca
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    You just have to sign up to get the step by step part!! :) It helps me a ton...

    • one year ago
  13. sandy524
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    i have missed many questions from its wrong answers. wolframalpha is more reliable

    • one year ago
  14. tinagca
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    Okay. maybe you just type them in wrong... it always helps me :D

    • one year ago
  15. tinagca
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    I dont use it for tests though... i use it for help... you use it for tests?

    • one year ago
  16. sandy524
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    okay sure but anyways thanks bye. now back to the question i need help with

    • one year ago
  17. Mimi_x3
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    @tinagca: Please don't divert people to another site; when someone is trying to help them.

    • one year ago
  18. tinagca
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    Mkay! later :D

    • one year ago
  19. tinagca
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    I was trying to give her a step by step site :o

    • one year ago
  20. Mimi_x3
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    That was retarded; interjecting out of the blue.

    • one year ago
  21. sandy524
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    please folks i really need help the bantering can be spared

    • one year ago
  22. tinagca
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    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.

    • one year ago
  23. zepdrix
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    |dw:1350314820570:dw|

    • one year ago
  24. sandy524
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    thank you zepdrix u are always so helpful

    • one year ago
  25. zepdrix
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    so do it piece by piece :) We have a (3x)', what is the derivative of 3x? :D

    • one year ago
  26. sandy524
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    simply 3

    • one year ago
  27. zepdrix
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    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

    • one year ago
  28. sandy524
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    -6sin(6x)

    • one year ago
  29. sandy524
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    right

    • one year ago
  30. zepdrix
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    Yay sandy \c:/

    • one year ago
  31. tinagca
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    You should give @zepdrix a medal @sandy524 ...i mean, that was a great answer!

    • one year ago
  32. zepdrix
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    lol tina c:

    • one year ago
  33. tinagca
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    :) I gave you a medal! :D

    • one year ago
  34. sandy524
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    ok so after that what do we do

    • one year ago
  35. zepdrix
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    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

    • one year ago
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