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    %% Implicit Function Plot
% Plot equations and implicit functions using |fimplicit|.
% 
% Plot the equation $(x^2 + y^2)^4 = (x^2 - y^2)^2$ over $-1 < x < 1$.
syms x y
eqn = (x^2 + y^2)^4 == (x^2 - y^2)^2;
fimplicit(eqn, [-1 1])