to test a real function for special symmetry (See if it is even or odd) with the Matlab Symbolic Math Toolbox I have used the following code:
syms x real;
f(x) = x^2;
solve(f(x) == f(-x), x)
Expected result is
Which is as far as I understand the Mupad Syntax for all real numbers. This Result was given until and including release R2014a.
From release R2014b on, I just get
which is obviously one single solution, but not all solutions to the equation.
In the release notes I did not see anything interesting about solve.