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Math Help - derivative help before im off to bed

  1. #1
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    derivative help before im off to bed

    Have an exam and need help with these 2 before im off to bed, im not sure where to start so if someone could help me in the right direction id appreciate it. Thanks :]



    and

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  2. #2
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    im in the library at school, still cant figure these two out...anyone here can lead me to the right direction? gracias :]
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  3. #3
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    Use chain rule and differentiate it with respect to theta.
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    Quote Originally Posted by tecknics View Post
    Have an exam and need help with these 2 before im off to bed, im not sure where to start so if someone could help me in the right direction id appreciate it. Thanks :]




    You can first write ln(e^w/(8+e^w)) = ln e^w - ln(8+e^w) =
    w - ln(8+e^w) , with w = theta, and the derivative of this is:

    1 - e^w/(8+e^w) = 8/(8+e^w)


    and


    Differentiate implicity: (1/y)dy + (1/x)dx = e^(x+y)dy + e^(x+y)dx ==>

    [1/y - e^(x+y)]dy = -[1/x - e^(x+y)]/dx...etc.

    Tonio
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  5. #5
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    Thanks i got it now:] just needed to be steered to the right direction
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