How can you sometimes decide from examining ƒx and ƒy that
Chapter 14, Problem 12QGY(choose chapter or problem)
Problem 12QGY
How can you sometimes decide from examining ƒx and ƒy that a function ƒ(x, y) is differentiable? What is the relation between the differentiability of ƒ and the continuity of ƒ at a point?
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