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Từ điển Oxford Advanced Learner 8th
cosine
co·sine [cosine cosines] BrE [ˈkəʊsaɪn] NAmE [ˈkoʊsaɪn] noun (abbr.cos) (mathematics)
the ↑ratio of the length of the side next to an ↑acute angle in a ↑right-angled triangle to the length of the longest side (= the ↑hypotenuse )
compare ↑sine, ↑tangent
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