cos(2π/7)+ cos(4π/7)+ cos(6π/7)+ cos(8π/7)what is the value of all
avi , 6 Years ago
Grade 12
Most Scoring Topics in IIT JEE> cos(2π/7)+ cos(4π/7)+ cos(6π/7)+ cos(8π/7...
1 Answers
Arun
Last Activity: 6 Years ago
Dear student
use formula of cosine series having diffrence in A.P.
Regards
Arun (askIITians forum expert)
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