Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ChrisV

  • 4 years ago

Find the derivative of the trigonometric function. f(x)=-x+tanx

  • This Question is Closed
  1. Mimi_x3
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Well, the derivative of tanx = sec^2x. so.. \[f'(x) = -1 + \sec^2x\]

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

    hmmmm how do i knw the derivative of tanx = sec^x?

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

    y' =sec²x - 1 http://www.wolframalpha.com/input/?i=derivative+of+y+%3D-x+%2B+tan%28x%29

  4. Mimi_x3
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Well, you have to like memorise the derivative of it.

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

    and the book says tan^2x so i assume sec^2x -1 = tan^2x

  6. Mimi_x3
    • 4 years ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Yes. Its a trig identity.

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

    oh i belive mimi just asking for my knowledge

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

    dont want someone just doing my homework for me

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

    lol

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

    id rather learn then just write down the correct answer :)

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

    You have to know the basic trig identities. Just a few of them and they are related.

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

    i am just wondering why my book doesnt tell me this before asking this question

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

    oh i know the trig identities but not the derivatives

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

    like i know 1-sin^2 = cos^2

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

    http://www.math.com/tables/derivatives/more/trig.htm

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

    but that didnt teach me the derivative of cos^2

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

    thanks i looked at it :)

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

    so i need to memorize these too?

  19. 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