Second partial derivative test example, part 1

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A worked example of finding a classifying critical points of a two-variable function.
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OMG is this Grant Sanderson from 3Blue1Brown??? The voice caught me off guard. BTW, Great video! A++

saulflores
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why isn't (0, 1) a critical point as well? It's the point we found first and then plugged into the second equation.

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