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

kaiz122

Directional Derivative please

  • one year ago
  • one year ago

  • This Question is Closed
  1. kaiz122
    Best Response
    You've already chosen the best response.
    Medals 0

    \[f(x,y)= \sin(xy)\] at \[2,\frac{\pi}{4}\]

    • one year ago
  2. muhammad9t5
    Best Response
    You've already chosen the best response.
    Medals 0

    do you mean f(x)=sinx. f(y)=siny

    • one year ago
  3. kaiz122
    Best Response
    You've already chosen the best response.
    Medals 0

    no, f(x,y)= sin(xy) Find \[d_{\theta}f(2, \frac{\pi}{4})\]

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

    Okay, easiest way to do this is with gradients.

    • one year ago
  5. muhammad9t5
    Best Response
    You've already chosen the best response.
    Medals 0

    oh looks like composite function.

    • one year ago
  6. kaiz122
    Best Response
    You've already chosen the best response.
    Medals 0

    my answer is 0. is this right?

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

    Hang on...

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

    Sorry, was preoccupied. The directional derivative of a function in the direction of the vector v is given by this formula: \[\large \nabla f(x,y) \cdot \frac{v}{||v||}\]

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

    So, first, you need to get the unit vector of \[<2, \frac{\pi}{4}>\]

    • 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.