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Question: b and c please ...

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5) Supposex -x-y-4 implicitly defines a function f such that y-) a) Use implicit differentiation to find y b) The point (2, 0) is on the graph. Use differentials to estimate b where (2.05, b) is on the graph. c) Why does the graph of the equation not have any horizontal tangents? (Hint: you need to use the original equation)

b and c please !

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