syms x;
f(x) = x^x;
f_x = diff(f,x);
f_xx = diff(f_x,x);
f_xxx = diff(f_xx,x);

disp("f'(x):");
disp(simplify(f_x,100));

disp("f''(x):");
disp(simplify(f_xx,100));

disp("f'''(x):");
disp(simplify(f_xxx,100));