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cosine

noun
🔊/ˈkəʊsaɪn/
🔊/ˈkəʊsaɪn/
(abbreviation cos)
(mathematics数学)
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  1. 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) 余弦compare sine, tangentTopics Maths and measurementc2