((cos ((2π)/9)))^(1/3) +((cos ((4π)/9)))^(1/3) −((cos (π/9)))^(1/3) =?


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Question Number 151922 by john_santu last updated on 24/Aug/21

$\sqrt[3]{\cos \frac{2 π}{9}} + \sqrt[3]{\cos \frac{4 π}{9}} - \sqrt[3]{\cos \frac{π}{9}} = ?$
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