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Trigo Help here plssss

  1. Oct 11, 2011 #1
    find the derivatives

    of differentiation of trigonometric functions

    1. y=cos(3x^2+8x-2)

    2. y=tan^3 2x

    3. y=sin5x sin^5 x

    4. y=Square root of 4sin^2x+9cos^2x

    help here please..

    i cant understand trigonometric functions
     
  2. jcsd
  3. Oct 11, 2011 #2

    SammyS

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    Welcome to PF.

    Please only post one or two questions per thread.

    Show us what you've tried.

    Where are you stuck?
     
  4. Oct 11, 2011 #3
    thank you summy

    our teacher didn't teach us.. and dont have any idea to solve this..

    Can u help me please, at least 2 of them :)

    thank you very much
     
  5. Oct 11, 2011 #4

    SammyS

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    The derivative of cos(x) is -sin(x) .

    Do you know the chain rule?
     
  6. Oct 11, 2011 #5
    i dont have any background with that sammy

    can u help me with number 3 and number 4

    please help me.. its our assignment and will be pass tom :)
     
  7. Oct 11, 2011 #6

    HallsofIvy

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    Excuse me? You have never been taught anything about derivatives of trig functions yet you are given an assignment like this? You should complain to your teacher's superior.
     
  8. Oct 11, 2011 #7
    yes. she didn't taught us.. because she will discuss it to us tomorrow..

    please help me :)
     
  9. Oct 11, 2011 #8
    help plssss..

    2 and 4 please.. im searching in google..

    but i cant get the logic..

    im not good in math so please help...
     
  10. Oct 11, 2011 #9

    SammyS

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    Do you know the chain rule.

    Can you find the derivative of

    (3x2+8x-2)1/2 ?
     
  11. Oct 11, 2011 #10

    Hootenanny

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    This thread is locked as a result of nephi37's refusal to follow our guidelines and provide an attempted solution.
     
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