derivative of cos(2lnx)

Posted on 2007-10-12
Last Modified: 2012-05-05
hi i am working on a differential equation and i need the derivative of

where a is an integer

how do i work this derivative ?

Question by:c_hockland
    LVL 84

    Accepted Solution

    cos(alnx)' = cos'(alnx) * (alnx)'
    (alnx)' = a (lnx)'
    cos'(x) = -sin(x)
    ln'(x) = 1/x
    LVL 19

    Assisted Solution

    You need to use the chain rule....

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