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I understand how to do (a). However, I'm having trouble with the rest, here. I've never properly learnt the order of operation for vectors like this.

For example, for (b) does one dot (r - r') with itself BEFORE using the del operator?

Thanks guys, help appreciated. Even if you point me to a good source for understanding this stuff I will be grateful.

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# Homework Help: Vector calculus and order of operations

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