Trigonometry the reciprocal of the tangent; specif.
- the ratio of the adjacent side of a given acute angle in a right triangle to the opposite side
- an equivalent, positive or negative ratio for certain related angles (Ex.: the cotangent of 57° or 237° is .6494, of 123° or 303° is ?.6494) or real numbers representing radians (Ex.: the cotangent of .9948 radians (57°) is .6494)
Origin of cotangentModern Latin cotangens from co. tangens, short for complementi tangens, literally , tangent of the complement
- The reciprocal of the tangent of an angle in a right triangle.
- The tangent of the complement of a directed angle or arc.
cot &thgr; = b a