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

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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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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