Partner of cos and tan in math (3)

I believe the answer is:

sin

(Other definitions for sin that I've seen before include "Fall from grace" , "Immorality" , "Immoral act" , "Breach of moral code" , "Mortal error" .)

I've seen this clue in the USA Today.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.