Note: Sorry, I'm not sure how to use Latex at the moment!
Suppose that two vectors A and B are the following A(0,1,-1), B(2,1,M)
Find the value of 'M' if the angle between A and B is Pi/4
I know the formula for computing angles between vectors is (Cos(theta) = a . b/|a||b|) but I am unsure...