Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

imagreencat

Hey guys! I would just like to ask if my partial differentiating is correct. f(x,y)=xy (sin (4yx^2)) fyx = sin 4yx^2 + (8yx^2)(cos 4yx^2) + (12yx^2)(cos 4yx^2) - 32(x^4)(y^2)(sin 4yx^2) Thanks!

  • one year ago
  • one year ago

  • This Question is Closed
  1. ash2326
    Best Response
    You've already chosen the best response.
    Medals 0

    You have differentiated with respect to x or y?

    • one year ago
  2. imagreencat
    Best Response
    You've already chosen the best response.
    Medals 0

    Well, fyx. So I first diff with respect to y then with respect to x. :)

    • one year ago
  3. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 2

    it's the mixed derivative? let me check...

    • one year ago
  4. ash2326
    Best Response
    You've already chosen the best response.
    Medals 0

    Ok :)

    • one year ago
  5. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 2

    \[f_x=y\sin(4yx^2)+8x^2y^2\sin(4x^2y)\cos(4x^2y)\]I'm typing it out so we can all see if I make a mistake...

    • one year ago
  6. imagreencat
    Best Response
    You've already chosen the best response.
    Medals 0

    Fy first. :) Then diff Fy with respect to x.

    • one year ago
  7. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 2

    the order shouldn't matter I don't think\[f_{xy}=\sin(4yx^2)+4yx^2\cos(4yx^2)+\frac{\partial}{\partial y}[8x^2y^2\sin(4x^2y)\cos(4x^2y)]\]

    • one year ago
  8. imagreencat
    Best Response
    You've already chosen the best response.
    Medals 0

    Actually in some cases the order does not matter. But in others, it does. Anyway, thank you turing test! :)

    • one year ago
  9. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 2

    oh but I have a 16...

    • one year ago
  10. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 2

    I'll do it the other way on paper to see if that makes a diff

    • one year ago
  11. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 2

    ok I redid it the other way and got the same answer as you sorry for the confusion

    • one year ago
  12. imagreencat
    Best Response
    You've already chosen the best response.
    Medals 0

    It's okay Turing Test. I'm sorry for taking some of your time. :))) But, thanks again. I appreciate your effort.

    • one year ago
  13. TuringTest
    Best Response
    You've already chosen the best response.
    Medals 2

    no it's my fault for messing up the first time you're welcome

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.