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CUSAT 2021 BTech Solved Paper Shift 3

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Question : 247 of 250
 
Marks: +1, -0
If the position vectors of A,B and C are respectively
^
i
+
^
j
+
^
k
,
^
i
−2
^
j
−4
^
k
 and 2
^
i
−3
^
j
−3
^
k
, then cos2B is equal to
Validate
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