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cos(2π/7)+ cos(4π/7)+ cos(6π/7)+ cos(8π/7) what is the value of all

 cos(2π/7)+ cos(4π/7)+ cos(6π/7)+ cos(8π/7)
what is the value of all 
 

Grade:12

1 Answers

Arun
25758 Points
4 years ago
Dear student
 
use formula of cosine series having diffrence in A.P.
 
Regards
Arun (askIITians forum expert)

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