- #1
Taulant Sholla
- 96
- 5
Homework Statement
I'm reading through the derivations of the linear wave equation. I'm following everything, except the passage I highlighted in yellow in the below attachment:
Homework Equations
I'm not understanding why partials must be used because "we evaluate this tangent at a particular instant of time."
The Attempt at a Solution
It seems if x, y, and t were all changing then there'd be a need for a partial. As stated in the highlighted text, I'm not getting it. Any help is appreciated.