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Byju's Answer
Standard XII
Mathematics
Scalar Triple Product
Let vectors a...
Question
Let vectors
→
a
and
→
b
make an angle
θ
=
2
π
3
between them. If
∣
∣
→
a
∣
∣
=
1
and
∣
∣
∣
→
b
∣
∣
∣
=
2
,
then
∣
∣
∣
(
→
a
+
3
→
b
)
×
(
3
→
a
−
→
b
)
∣
∣
∣
2
is
Open in App
Solution
∣
∣
∣
(
→
a
+
3
→
b
)
×
(
3
→
a
−
→
b
)
∣
∣
∣
2
=
∣
∣
∣
3
→
a
×
→
a
−
→
a
×
→
b
+
9
→
b
×
→
a
−
3
→
b
×
→
b
∣
∣
∣
2
=
∣
∣
∣
3
×
→
0
−
→
a
×
→
b
−
9
→
a
×
→
b
−
3
×
→
0
∣
∣
∣
2
=
∣
∣
∣
−
10
→
a
×
→
b
∣
∣
∣
2
=
100
[
∣
∣
→
a
∣
∣
∣
∣
∣
→
b
∣
∣
∣
sin
θ
]
2
=
100
[
2
sin
2
π
3
]
2
=
100
[
2
sin
(
π
−
π
3
)
]
2
=
100
[
2
sin
π
3
]
2
=
100
(
2
×
√
3
2
)
2
=
100
×
3
=
300
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0
Similar questions
Q.
Let vectors
→
a
and
→
b
make an angle
θ
=
2
π
3
between them. If
∣
∣
→
a
∣
∣
=
1
and
∣
∣
∣
→
b
∣
∣
∣
=
2
,
then
∣
∣
∣
(
→
a
+
3
→
b
)
×
(
3
→
a
−
→
b
)
∣
∣
∣
2
is
Q.
Let
and
be two unit vectors and
θ
is the angle between them. Then
is a unit vector if
(A)
(B)
(C)
(D)