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| First I assign an equation to cir1: In[21]:= cir1 = x^2 + y^2 == 1 Out[21]= x^2 + y^2 == 1 then if I plot the equation it works fine ContourPlot[x^2 + y^2 == 1, {x, -1, 1}, {y, -1, 1}] But if I try the same thing with... |