Crossword Genius

Calc prerequisite (4)

Ross

I believe the answer is:

trig

'calc prerequisite' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for trig that I've seen before include "Maths subject (informal)" , "Study of sines etc (abbr)" , "tight" , "Neat" , "Smart" .)

I've seen this clue in the New York Times, the Universal, the Wall Street Journal, the USA Today and the LA Times.
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