Partial derivatives

a derivative of a function of two or more variables with respect to one variable, the other(s) being treated as constant.


So, I really wanna say, all those things is about who you should treat as variable, who you should treat as constant

For example:

, you should see as variable, as constant

, you should see as variable, as constant

And for , first see as variable, do calculation, then see as variable, get result

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