Answer: cotan

AnswerCrossword Clue
COTANTrig function
COTANRight-triangle ratio, for short
COTANTrig ratio
COTANTrig function: Abbr.
cotanthe tangent of the complement, or the reciprocal of the tangent, of a given angle or arc
cotana trigonometrical function of an angle
cotan(in a right triangle) the ratio of the side adjacent to a given angle to the side opposite