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Homework Help: Product rule with chain rule (derivation wrt time)

  1. Dec 14, 2009 #1
    I'm trying to find the derivative of 0 = 3xcosƟ with respect to time.

    I know I should use the product rule for x and cosƟ. But I don't know what I should do with the constant 3.

    would it be like this?

    0 = 3x(-sinƟ)(dƟ/dt) + 3(dx/dt)(cosƟ)
  2. jcsd
  3. Dec 14, 2009 #2
    Yes, that's correct.
  4. Dec 14, 2009 #3
    thank you
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