Crossword Genius

Counterpart of sin, in trigonometry (3)

Ross

I believe the answer is:

cos

(Other definitions for cos that I've seen before include "Kind of lettuce in microcosm" , "Lettuce with long crisp leaves" , "Variety of lettuce" , "providing unsatisfactory explanation?" , "Casual as" .)

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