Derivative introduction

Introduction to differential calculus
Derivative as slope of tangent line
Derivative as instantaneous rate of change
Secant lines
Derivative as a limit
Formal definition of derivative
Using the formal definition of derivative
Derivative as a function
Review: Derivative basics
About this unit
Get comfortable with the big idea of differential calculus, the derivative. The derivative of a function has many different interpretations and they are all very useful when dealing with differential calculus problems. This topic covers all of those interpretations, including the formal definition of the derivative and the notion of differentiable functions.