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Explain how limit has change moving from 1-variable functions to 2 or more variables. Why is...

Explain how limit has change moving from 1-variable functions to 2 or more variables. Why is showing lim(x,y)→(a,b ) f (x, y) exists more difficult in so many cases than showing limx→a f(x) exists?

Explain why a two or three variable function: f’ (x, y) and f ‘ (x, y, z) are not functions we find in calculus.

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