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pol:=x^4+x^3-x^2-x;
whattype(pol);
nops(pol);
op(pol);
op(1,pol);
subs(x=0, cos(x)*(sin(x)+x^2+1));
eval(%);
subs(x=y, y=z, x*y^2);
subs({x=y, y=z}, x*y^2);
subs(x*y=product, x*y*z);
algsubs(x*y=product, x*y*z);
subsop(3=y, x^2+x+1/x);
vyraz:=(x^2+2*x+1)^2+(x^2-2*x+1)^2;
map(factor, vyraz);
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