Maxima on line
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expand((x-2)^3*(x+1/3)^2); solve(x^2-x+2=0); invert(matrix([2,3,1], [a,0,0], [1,4,8])); integrate(x * sin(x), x); draw3d(explicit(x^2+y^2,x,-1,1,y,-1,1));
Yamwi