When I use the INT function to integrate a symbolic expression, I receive an expression that contains an extra variable _R. For example,
syms x yy = int(1/(x^3+x+1),x);
returns,
y = sum(1/(3*_R^2+1)*log(x-_R),_R = RootOf(_Z^3+_Z+1))
Symbolic Math Toolbox
syms x yy = int(1/(x^3+x+1),x);
y = sum(1/(3*_R^2+1)*log(x-_R),_R = RootOf(_Z^3+_Z+1))
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