The Derivative and the Tangent Line Problem. Local Linearity.

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Presentation transcript:

The Derivative and the Tangent Line Problem

Local Linearity

Definition of the Derivative of a Function Notes: 1.The derivative evaluated at c gives you the slope of the tangent line to the graph of f at x = c 2.The derivative gives you the slope of the graph of f at any point on the graph. 3.The derivative gives you the instantaneous rate of change of f at any point on the graph.

Examples

Notes and Notation… Some notes: The process of finding the derivative of a function is called differentiation. A function is differentiable at x if its derivative exists, and differentiable on an open interval if it is differentiable at every point in the interval. Notation: read “the derivative of y with respect to x”

Examples

4)Sketch a graph of a function whose derivative is always positive. 5) Sketch a graph of a function whose derivative is always negative.

Differentiability and Continuity

Three Examples

Theorem If f is differentiable at x = c, then f is continuous at x = c. What features in the graph of f indicate that the function cannot be differentiated at that point?