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The value of cos^2 π/9 + cos^2 2π/9 + cos^2 4π/9 is

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The value of cos2 π/9 + cos2 2π/9 + cos2 4π/9 is

(A)  0 

(B)  3 

(C)  9 

(D)  None of these

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Correct option (D) None of these 

We have cos2 π/9 + cos2 2π/9 + cos2 4π/9

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