Partial derivatives | Appendix E | Differential Equations for Engineers

Definition of the partial derivative. Join me on Coursera: https://imp.i384100.net/mathematics-for-engineers Lecture notes at http://www.math.ust.hk/~machas/differential-equations-for-engineers.pdf Paperback book at https://www.amazon.com/dp/B0BL9X4QWN/ Subscribe to my channel: http://www.youtube.com/user/jchasnov?sub_confirmation=1