KEAM 2012 Math Paper

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Question : 26 of 120
 
Marks: +1, -0
If zk=eiθk=x+1 for k=1,2,3,4,where i2=1, and if |
4
Σ
k=1
zk
|
=1
,
then |
4
Σ
k=1
zk
|
is equal to
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