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133 partial derivatives (part 1). Get full lessons & more subjects at. A review of differentials from calculus 1 and an extrapolation towards differentia.
This is just a few minutes of complete course. Calculus 3 lecture 112. Vectors in 3d coordinate system.
How to find a directional derivative along the path of any given vector. How to find relative (local) and absolute extrema of 2 variable functions.