COSINE is a playable word

cosine Scrabble® Dictionary

noun
pl. cosines
a trigonometric function of an angle
68 Playable Words can be made from "COSINE"
   2-Letter Words (12 found)
   3-Letter Words (21 found)
   4-Letter Words (19 found)
   5-Letter Words (12 found)
   6-Letter Words (4 found)