How to find cosine of the angle between two vectors?

b = 5i +3j, c = 2i + 4j + k, find cosine of the angle between b and c.

How to find cosine of the angle between two vectors?
A . B = |A|*|B|*cos(theta),


where theta is the angle between the vectors.


Solve this for cos(theta), plug in your vectors, do the algebra (argument of each vector and their dot product), and there's your answer.
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