solve in maxima and ratsimp



Look at this example:

f:(x^2*(x+3))^(1/3);

f1:diff(f,x);

solve(f1);

x=2;

f2:diff(f1,x);

solve(f2);

[ ]

f3:ratsimp(f2);

solve(f3);

x=-3

If I solve f2, it is correct, but if I solve f3, it is not correct, x=-3 is
out of domain in f2.

Best regards.

Luigi Marino 



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