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Q)
If
→
a
=
ˆ
i
+
ˆ
j
−
ˆ
k
and
→
b
=
+
λ
ˆ
i
−
3
ˆ
j
+
ˆ
k
and the orthogonal projection of
→
b
on
→
a
is
4
3
(
ˆ
i
−
ˆ
j
−
ˆ
k
)
, then
λ
is equal to
(
a
)
0
(
b
)
2
(
c
)
12
(
d
)
−
1
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