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Taking the derivative (no numbers)

  1. Apr 4, 2015 #1
    1. The problem statement, all variables and given/known data
    So I'd rather not type out the whole equation I am differentiating with respect to t... Sorry admins. My written work is on the image. I just want to make sure my work is correct.

    2. Relevant equations
    The equation is a differential characteristic equation with cos and sin.

    3. The attempt at a solution
    The attempt solution is on the image. Start at Line 1 to Line 2.

    I applied product rule twice with chain rule. We are taking the derivative of the formula with respect to t.
     

    Attached Files:

  2. jcsd
  3. Apr 4, 2015 #2

    vela

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    From what I can see in that little thumbnail, it looks fine.
     
  4. Apr 5, 2015 #3
     
  5. Apr 5, 2015 #4

    vela

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    You simplified? It's hard to see anything in that little thumbnail, so I'll take your word for it. I suppose I could click on the thumbnail to bring up the larger image, but I'd rather not.
     
  6. Apr 5, 2015 #5

    SammyS

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    No .

    sin(θ) + cos(θ) ≠ 1

    However, sin2(θ) + cos2(θ) = 1, but you don't have that anywhere.
     
  7. Apr 5, 2015 #6
    Sorry for the small iMage. I got it figured out.
     

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