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3.1 9.1 Basic concepts of multivariable functions
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3.2 9.2 partial derivatives
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3.3 9.3 total differentials
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3.4 9.4 Differentiation Rules of Multivariate Composite Functions
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3.5 9.5 Differentiation of Implicit Functions
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3.6 Exercise class 1
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3.7 9.6 Applications of differential calculus of multivariable functions in Geometric
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3.8 9.7 Directional derivatives and gradient
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3.9 9.8 The extremum of function of multiple variables and its solution
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3.10 Exercise class 2