"Bütün sınıf kara tahtada coşar" ifadesi, trigonometrik fonksiyonların analitik düzlemin hangi bölgelerinde hangi işaretleri alacağını gösteren bir formüldür 13.
Bu formüle göre, "coşar" ifadesi 4. bölgede geçerlidir ve bu bölgede kosinüs fonksiyonu pozitiftir 13.
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