We spent the majority of class today discussing how the Average Rate of Change (slope of a secant line) becomes the Instantaneous Rate of Change (slope of a tangent line).  We reviewed the Classic (limit) Definition of a Derivative:  .  We also talked about the Variation on the Classic Definition of .  We also practiced finding the derivative of a function using these definitions.  We closed the period while discussing the Symmetric Difference Quotient:  .