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find-by-using-de-moivre-s-formula-cos-2-




Question Number 89032 by M±th+et£s last updated on 14/Apr/20
find by using de moivre′s formula  cos(2°)=?
$${find}\:{by}\:{using}\:{de}\:{moivre}'{s}\:{formula} \\ $$$${cos}\left(\mathrm{2}°\right)=? \\ $$

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