Cos(π/11) + Cos(3π/11) + Cos(5π/11) + Cos(7π/11) + Cos(9π/11) + is equal to : (1) 1..| Doubtify JEE
Cos(π/11) + Cos(3π/11) + Cos(5π/11) + Cos(7π/11) + Cos(9π/11) + is equal to :
(1) 1 (2) 1/2 (3) 1/4 (4) 2
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