Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

zurf

  • 3 years ago

Find the derivative of f(x) = -cos (2x^2-3)

  • This Question is Closed
  1. wio
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Do you know how to use the chain rule?

  2. zurf
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah yes i do

  3. wio
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Well your inner function is \(2x^2-3\) and your outer function is \(-\cos(x)\). There shouldn't be anything hard about this.

  4. zurf
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    do we have to use chain rule ? i'm confused on what we should do when with the -cos

  5. wio
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    The - is just \(-1\cdot \cos(x)\). It's a constant. You can pull it out and put it back in after.

  6. zurf
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oh really? but this have to use f(x+h)-f(x) first derivation ..

  7. wio
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You have to use this you mean? \[\Large \lim_{h\rightarrow 0}\frac{f(x+h)-f(x)}{h}\]

  8. wio
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You're not allowed to use the chain rule?

  9. zurf
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh sorry, i just realised it only has to use chain rule. I make things go more complicated -_-

  10. wio
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So can you do it now?

  11. zurf
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah the answer is sin(2x^2-3)(4x) right ?

  12. RadEn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah, i agree that

  13. zurf
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Oh thank you so much :D

  14. wio
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    It's correct.

  15. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy