Ms. Benton gives her students a reading list with 12 books. She requires them to read 2 books from the list during the grading period. In how many
different ways can 2 books be chosen?

Hello! i hope this
since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.

Im pretty sure it is a