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Math Help - differentiation help please

  1. #1
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    differentiation help please

    Hi,

    Can anyone give me the second derivative for the equation below:

    \frac{p^r}{(1-(1-p)e^t)^r}<br />

    I have done it but not sure if the answer is correct.

    Thanks.

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  2. #2
    MHF Contributor

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    Show us what you did and we can say whether it is correct or not.
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  3. #3
    Junior Member lanzailan's Avatar
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    Quote Originally Posted by Amazed View Post
    Hi,

    Can anyone give me the second derivative for the equation below:

    \frac{p^r}{(1-(1-p)e^t)^r}<br />

    I have done it but not sure if the answer is correct.

    Thanks.

    i got something like this.. not sure whether it is correct or wrong

    \frac{r-rp^r(-e^t+pe^t)}{(1-(1-p)e^t)^{r+1}}<br />
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  4. #4
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    i got :

    \frac{r(p^r)(-r-1)((1-p)e^t)^2}{[1-(1-p)e^t]^(r+2)}<br />


    the r+2 is the power to which the denominator is raised to.. im just having trouble in typing it in the equation.

    thanks
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  5. #5
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    Mistyped in my last post.

    And that's what i get for the second derivative:

    \frac{-r(p^r)(-r-1)((1-p)e^t)^2}{[1-(1-p)e^t]^{r+2}}<br /> <br />


    Is it correct please?
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