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A notation is simply just a way to represent something (in this case, to represent a partial derivative).
The partial derivate of f(x,y) with respect to y would look like...
f(x,y)
If you see "∂" instead of "d" in Leibnitz notation, it means you're working with partial derivatives!
Lagrange notation doesn't have a spot to declare what variable you're taking the derivative with respect to... so we won't use it with partial derivatives!
The partial derivate of f(x,y) with respect to x, and then y would look like...
When working with multiple variables, take derivatives with respect to the variables in the same order declared!
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