Multivariable chain rule and differentiability

[@LJStability]

Thank you so much for these videos. It's so nice to have a person who can teach math is a way that is actually fun.

[@MasAkaVenom]

I dont know if you still read comments but thank you so much for this.

[@KellyPedro]

very good video. Thank you from Lima, Perú.

[@toposmartin8652]

thank you chris

[@humanboeing777]

Sectian theEEEE