> sage: solve([x==1,y+2==3],x,y)
> [[x == 1, y == 1]]
> sage: solve([sin(x)=sage: solve([sin(x)==1,y+2==3],x,y)
> []
>

Actually, this is a bug in Maxima.

(%i8) solve([x=1,y=1]);
(%o8)                          [[y = 1, x = 1]]
(%i9) solve(sin(x)=1);

solve: using arc-trig functions to get a solution.
Some solutions will be lost.
                                        %pi
(%o9)                              [x = ---]
                                         2
(%i10) solve([sin(x)=1,y=1]);
(%o10)                                []

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