Crossword Genius

Sin : y-axis :: ___ : x-axis (3)

Ross

I believe the answer is:

cos

(Other definitions for cos that I've seen before include "Islanders here" , "Greek island and type of lettuce" , "A long-leaved lettuce" , "Casual as" , "in the Dodecanese?" .)

I've seen this clue in The New York Times.
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