KEAM 2012 Math Paper

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Question : 91 of 120
 
Marks: +1, -0
If
−
a
=
⋀
i
−
⋀
j
and
−
b
=
⋀
j
+
⋀
k
,
then |
−
a
×
−
b
|
2
+
|
−
a
.
−
b
|2
is eqaul to
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