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JEEMAIN-2015
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Q)
Let
→
a
,
→
b
and
→
c
be three are col linear and
(
→
a
×
→
b
)
×
→
c
=
1
3
|
→
b
|
|
→
c
|
→
a
. If
θ
is the angle between vectors
→
b
and
→
c
, then a value of
sin
θ
is :
2
3
−
2
√
3
3
2
√
2
3
−
√
2
3
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