KEAM 2012 Math Paper

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Question : 88 of 120
 
Marks: +1, -0
If
−
a
=2
⋀
i
+3
⋀
j
+α
⋀
k
and
−
b
=3
⋀
i
−α
⋀
j
+2
⋀
k
,
then the angle between
−
a
+
−
b
and
−
a
−
−
b
is
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