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.
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”