Find the projection of the vector 
ˆ
ˆ
3ˆ
7
i
j
k
+
+
 on the vector 
ˆ
ˆ
ˆ
7
8
i
j
k
−
+ 5 Show that each of the given three vectors is a unit vector:
1
1
1
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
ˆ
(2
3
6 ), 
(3
6
2 ),  
(6
2
3 )
7
7
7
i
j
k
i
j
k
i
j
k
+
+
−
+
+
−
Also, show that they are mutually perpendicular to each other © NCERT
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 MATHEMATICS
448
6