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    %% Plot Implicit Symbolic Function
% Plot the hyperbola described by the function $f(x,y) =
% x^2 - y^2  - 1$ by first declaring the symbolic function |f(x,y)| using
% |syms|. The |fimplicit| function uses the default interval of  $[-5, 5]$
% for $x$ and $y$. 

syms f(x,y)
f(x,y) = x^2 - y^2 - 1;
fimplicit(f)