Crossword Genius

Trigonometry function (4)

Ross

I believe the answer is:

sine

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">trigonometry function</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for sine that I've seen before include "Mathematical function" , "Indefinitely, with no appointed date - . . . . die" , "Indispensable condition" , "Trig function" , "Trigonometric function" .)

I've seen this clue in The New York Times, the USA Today and The Times.
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