Multivariable Calculus | The second derivative test.

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We present the second derivative test for functions of two variables and give some examples.

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I often wish this course came after linear algebra, and then this can all be viewed in terms of eigenvalues with the corresponding geometry revealed.

ProfOmarMath
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Can you explain why that works?
that D=fxx fyy-(fxy)²
From that how do we know either the point is local min/local max or saddle

KSMK