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TN XII Math
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Q)
If the projection of
→
a
on
→
b
and the projection of
→
b
on
→
a
are equal then the angle between
→
a
+
→
b
and
→
a
−
→
b
is
(
1
)
π
2
(
2
)
π
3
(
3
)
π
4
(
4
)
2
π
3
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