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Найти сумму косинусов Find sum of cosines

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Найти сумму косинусов 𝑐𝑜𝑠(4π/5) 𝑐𝑜𝑠(2π/5). Find the Value of 𝑐𝑜𝑠(4π/5) 𝑐𝑜𝑠(2π/5). Описание курса по тригонометрии / trigonometry course #игорьтиняков #элементарнаяматематика #trigonometry #тригонометрия

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