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Is $dy/dx$ not a ratio?

Construct a function which is continuous in $[1,5]$ but not differentiable at $2, 3, 4$

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Do free online collaborative solution manuals exist?

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If a function is continuously differentiable and bounded, is its derivative also bounded?

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Why are even/odd functions called even/odd?

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Can the chain rule be relaxed to allow one of the functions to not be defined on an open set?

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Can one define the derivative of a function using tangent cones? Does such a notion already exist?

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