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sandy524

  • 2 years ago

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

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

  2. sandy524
    • 2 years ago
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    yes

  3. Mimi_x3
    • 2 years ago
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    So, what have you done?

  4. sandy524
    • 2 years ago
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    but how would i use it in this case

  5. Mimi_x3
    • 2 years ago
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    Where are you having problems?

  6. sandy524
    • 2 years ago
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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...

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

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

  9. sandy524
    • 2 years ago
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    mathway is not credible

  10. Mimi_x3
    • 2 years ago
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    Well, have you atleast tried it?

  11. tinagca
    • 2 years ago
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    How i learn a lot from that site...

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

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

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

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

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

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

  18. tinagca
    • 2 years ago
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    Mkay! later :D

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

  20. Mimi_x3
    • 2 years ago
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    That was retarded; interjecting out of the blue.

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

  22. tinagca
    • 2 years ago
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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.

  23. zepdrix
    • 2 years ago
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    |dw:1350314820570:dw|

  24. sandy524
    • 2 years ago
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    thank you zepdrix u are always so helpful

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

  26. sandy524
    • 2 years ago
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    simply 3

  27. zepdrix
    • 2 years ago
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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

  28. sandy524
    • 2 years ago
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    -6sin(6x)

  29. sandy524
    • 2 years ago
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    right

  30. zepdrix
    • 2 years ago
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    Yay sandy \c:/

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

  32. zepdrix
    • 2 years ago
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    lol tina c:

  33. tinagca
    • 2 years ago
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    :) I gave you a medal! :D

  34. sandy524
    • 2 years ago
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    ok so after that what do we do

  35. zepdrix
    • 2 years ago
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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

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