AP Calculus AB and BC: Video Lessons are linked below.
Unit 1: Limits and Continuity (Unit 1 Playlist)
1.05 -- Determining Limits Using Algebraic Properties of Limits (this topic has THREE videos: VIDEO 1, VIDEO 2, and VIDEO 3.)
1.06 -- Determining Limits Using Algebraic Manipulations (this topic has TWO videos: VIDEO 1 and VIDEO 2)