Longman Dictionary of Contemporary English homepage

Topic: MATHS

Date: 1600-1700
Language: Modern Latin
Origin: cosinus, from co- + Medieval Latin sinus ( SINE)

cosine

noun
     
co‧sine [countable] technical
HM the measurement of an acute angle in a triangle with a right angle, that is calculated by dividing the length of the side next to it by the length of the hypotenuse [↪ sine]
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