Using ln function with symbolic variables

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Del il 18 Mag 2013
I am using symbolic variables, and I would like to use an ln function. But I keep getting an error. Is it possible at all to involve a logarithmic function with symbolic variables?
I have
syms x1 x2
f=ln(x1+x2);
and I am gettingthe error: Undefined function 'ln' for input arguments of type 'sym'.

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