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JEEMAIN and NEET
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JEEMAIN PAST PAPERS
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2004
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Q)
Let
¯
a
,
¯
b
and
¯
c
be non-zero vectors such that
(
¯
a
×
¯
b
)
×
¯
c
=
1
3
|
¯
b
|
|
¯
c
|
¯
a
. If
θ
is the acute angle between the vectors
¯
b
and
¯
c
, then
sin
θ
equals
( A )
2
3
( B )
1
3
( C )
√
2
3
( D )
2
√
2
3
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