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n(th) Derivatives of unknown Functions


Hi,

Consider F to be an unknown function. I would like to solve

             d^s  / dx^k F[2 x - a]

(a is a constant, F a function with real numbers as input and real
numbers as output, (no vectors)).

With
            D[ F[2 x - a], {x, s} ]
as Mma-Input I don't get the result
                 (s)
            2^s F   [2 x - a]

Is there any way to work around? Thanks for an answer!

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