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

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

$$\:\:\sqrt[{\mathrm{3}}]{\mathrm{cos}\:\frac{\mathrm{2}\pi}{\mathrm{9}}}\:+\sqrt[{\mathrm{3}}]{\mathrm{cos}\:\frac{\mathrm{4}\pi}{\mathrm{9}}}−\sqrt[{\mathrm{3}}]{\mathrm{cos}\:\frac{\pi}{\mathrm{9}}}\:=? \\ $$$$ \\ $$

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