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2.1 Derivatives Great Sand Dunes National Monument, Colorado Vista High, AB Calculus. Book Larson, V9 2010Photo by Vickie Kelly, 2003

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is called the derivative of at. We write: “The derivative of f with respect to x is …” There are many ways to write the derivative of

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“f prime x”or “the derivative of f with respect to x” “y prime” “dee why dee ecks” or “the derivative of y with respect to x” “dee eff dee ecks” or “the derivative of f with respect to x” “dee dee ecks uv eff uv ecks”or “the derivative of f of x”

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dx does not mean d times x ! dy does not mean d times y !

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does not mean ! (except when it is convenient to think of it as division.) does not mean ! (except when it is convenient to think of it as division.)

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(except when it is convenient to treat it that way.) does not mean times !

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In the future, all will become clear.

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The derivative is the slope of the original function. The derivative is defined at the end points of a function on a closed interval.

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A function is differentiable if it has a derivative everywhere in its domain. It must be continuous and smooth. Functions on closed intervals must have one-sided derivatives defined at the end points.

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Chapter 17.2 The Derivative. How do we use the derivative?? When graphing the derivative, you are graphing the slope of the original function.

Chapter 17.2 The Derivative. How do we use the derivative?? When graphing the derivative, you are graphing the slope of the original function.

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