MATH U101 · Narrated walkthrough · Module 4 §14.3–14.4
Partial derivatives and implicit differentiation, from zero
A narrated lesson that builds the partial derivative from a picture, derives the implicit-differentiation rule, then solves Tutorial 6 Q1 and Q2. Press play, keep the sound on, and answer the four questions it stops to ask you.
About seven minutes, watch once. The narration stops four times to ask what the next move is. Commit to an answer before it continues: those pauses are the point, because they practise starting a question, not following one. Captions are on by default; the full transcript is below the player.
Redo T6 Q1 and Q2 on paper without looking, then check against the written solutions in the tutorial companion. The rules are in Module 4 notes; for a slower first pass, read the Module 4 lesson.