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Homework Help: Taking 2nd, 3rd and 4th derivatives

  1. Mar 21, 2012 #1
    1. The problem statement, all variables and given/known data

    a) d^2/(dx^2): ln(x+1)
    b) d^3/(dx^3): x^7 + 4x^6 - x^2
    c) d^2/(dx^2): 1/(x + 1)
    d) d^4/(dx^4): cos(2x)

    2. Relevant equations
    none


    3. The attempt at a solution

    Can someone tell me if these are right?

    a)= -(1/(x + 1)^2)
    b)=210x^4 + 480x^3
    c)= (2/(x + 1)^3)
    d)= 16cos(2x)
     
  2. jcsd
  3. Mar 21, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi Cacophony! :smile:

    (try using the X2 button just above the Reply box :wink:)
    Yes, they're fine. :smile:
     
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