3. Addition and subtraction of vectors





Given a vector and any point O, the triangle rule for addition shows us that = + . We can rewrite this equation as
Since points to the head of the vector and points to its tail, we call this the “headminustail” rule.
The advantage of this rule is that it allows us to rewrite all the vectors occurring in a problem as combinations of vectors emanating from a given point O (often called the origin). 

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