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cotangent
noun
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)
See cotangent in American Heritage Dictionary 4
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