решаем по формуле:
сos(α-β)=cosαcosβ+sinαsinβ
cos107cos17+sin107sin17= cos(107-17)=cos90=0
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решаем по формуле:
сos(α-β)=cosαcosβ+sinαsinβ
cos107cos17+sin107sin17= cos(107-17)=cos90=0