AP EAMCET Engineering 2018 Apr 23 Shift 1 Paper

Section: Mathematics
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Question : 10 of 160
 
Marks: +1, -0
If a = cos (
8Ï€
11
)
+ i sin (
8Ï€
11
)
, then Re (a + a2+a3+a4+a5) =
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