Derivative and Tangent Line (using slope and limits)
Derivative and Tangent Line-Part 1
http://www.youtube.com/watch?v=CgXWuRgAL6Q
Derivative and Tangent Line-Part 2
http://www.youtube.com/watch?v=TpSZzK4iDbk
Derivative and Tangent Line-Part 3
http://www.youtube.com/watch?v=uo-kggYntBE
Derivative and Tangent Line-Part 4