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# A quick question about vectors

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1. Recently, I saw someone write:
|OC - OB|^2 = |OC^2 - 2OC*OB + 2OB| where OC and OB are both vectors.
Can you write this? It is just I am not sure if the two expressions are the same.

Thank you in advance!
2. (Original post by spacewalker)
Recently, I saw someone write:
|OC - OB|^2 = |OC^2 - 2OC*OB + 2OB| where OC and OB are both vectors.
Can you write this? It is just I am not sure if the two expressions are the same.

Thank you in advance!
I have never seen it written like that in normal or further maths and it does not look like it would work, I could be wrong but I am pretty sure it cannot be written like that

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