cos vs cosine

cos

conj
  • because 

noun
  • A variety of lettuce with long, crisp leaves. 

  • A cousin, cuz. 

cosine

noun
  • In a right triangle, the ratio of the length of the side adjacent to an acute angle to the length of the hypotenuse. Symbol: cos 

How often have the words cos and cosine occurred in a corpus of books? (source: Google Ngram Viewer )