derivative of cos(2lnx)

hi i am working on a differential equation and i need the derivative of

cos(alnx)
where a is an integer

how do i work this derivative ?

c_hocklandAsked:
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ozoCommented:
cos(alnx)' = cos'(alnx) * (alnx)'
(alnx)' = a (lnx)'
cos'(x) = -sin(x)
ln'(x) = 1/x
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BrianGEFF719Commented:
You need to use the chain rule....
   http://en.wikipedia.org/wiki/Chain_rule
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