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Parametrization and Extrema for Multivariable Function [duplicate]
We are given the function:
$$f(x,y)=x^2+xy+x+y^2$$
On the set $S=\{(x,y):x^2+y^2 \leq 9\}$
I found the critical point on the interior of $S$ to be $(-2/3,1/3)$.
I am asked to parametrize the ...