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## Main Question or Discussion Point

This is something that has been bothering me...

Given two vectors

Is there a way to prove that

I'm concerned with WHY this is the case... If anyone has a good proof that would be great.

Given two vectors

**A**and**B**Is there a way to prove that

**A**dot**B**= ABcosθ ?I'm concerned with WHY this is the case... If anyone has a good proof that would be great.