
Can we simply hold $x$ or $z$ constant for all of the equation ? (not only for one partial differentiation)
furthermore, if we hold $x$ constant so that $dx= 0$ like what he did in the last equation, we will have 
so:


Can we simply hold $x$ or $z$ constant for all of the equation ? (not only for one partial differentiation)
furthermore, if we hold $x$ constant so that $dx= 0$ like what he did in the last equation, we will have 
so:

Copyright © 2021 JogjaFile Inc.