Calc 3 14.4 Notes: Tangent Planes and Linear Approximations

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Objectives:
7. Define the total differential.
8. Use the total differential to approximate the change in a function.

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why is x=x0; y=y0 a plane. I thought it's a line ? e.g: x = 3; y = 5 is a line parallel to Oz and can have any z value. thank you

nguyenquoctran