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>>
JEEMAIN and NEET
>>
Mathematics
>>
Class12
>>
Vector Algebra
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Q)
If
→
a
=
x
2
ˆ
i
+
2
ˆ
j
−
2
ˆ
k
,
→
b
=
ˆ
i
−
ˆ
j
+
ˆ
k
a
n
d
→
c
=
x
2
ˆ
i
+
5
ˆ
j
−
4
ˆ
k
are three vectors, then the values of
x
for which the angle between
→
a
a
n
d
→
b
is acute and that between
→
b
a
n
d
→
c
is obtuse is ?
(
A
)
x
∈
(
−
3
,
3
)
(
B
)
x
∈
(
−
3
,
2
)
∪
(
2
,
3
)
(
C
)
x
∈
(
−
3
,
2
)
(
D
)
x
∈
[
−
3
,
3
]
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