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Saddle points
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Multi-variable Optimization & the Second Derivative Test
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Differentiation (Maxima and Minima)
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The Lagrangian
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Multivariable functions | Multivariable calculus | Khan Academy
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Calculus 3 Lecture 13.8: Finding Extrema of Functions of 2 Variables (Max and Min)
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¿Cómo es realmente el pensamiento matemático?
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