KUET_17-18

cos2A+cos2(A+π3)+cos2(Aπ3)\cos ^{2} \mathbf{A}+\cos ^{2}\left(\mathbf{A}+\frac{\pi}{3}\right)+\cos ^{2}\left(\mathbf{A}-\frac{\pi}{3}\right) এর মান কোনটি-

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