Find the unit vector which bisects the angle between the vectors  4i - 4 j + 7k and - i +2 j - 2k

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter8: Applications Of Trigonometry
Section8.4: The Dot Product
Problem 6E
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Find the unit vector which bisects the angle between the vectors 
4i - 4 j + 7k and - i +2 j - 2k

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the answer we were given was i/4 + 2j/4 + k/4

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