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TN XII Math
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Q)
If
→
a
and
→
b
are two unit vectors and
θ
is the angle between them, then
(
→
a
+
→
b
)
is a unit vector if
(
1
)
θ
=
π
3
(
2
)
θ
=
π
4
(
3
)
θ
=
π
2
(
4
)
θ
=
2
π
3
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