Finding the limit of a symbolic function

Hi,

I am trying to find the limit of the following symbolic expression:

syms x
A=[0.8 0.6; -0.6 0.8]
f(x) = eig((0.9*A)^x)

limit(f(x), x, inf)

But cannot seem to get past the following error:

    Error using mupadmex
    Error in MuPAD command: An arithmetical expression is expected. [ln]

Am I missing the boat on the use of symbols, or does it have something to do with the eig() function I'm using?

I expect f(x) to return a set of complex numbers.

Thanks.