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The ratio of the hypotenuse (in a right-angled triangle) to the side opposite an acute angle; the reciprocal of sine.

*‘The other angle, B has its tanglent equal to its cosecant (the reciprocal of the sine).’**‘The variance of D is computed from the variance of the misclosure W scaled with the separation of the planes of position dv and the cosecant of the angle of maximum inclination of the slope dd.’**‘The secant and cosecant were not used by the early astronomers or surveyors.’**‘No I'm not, that's quite the negative cosecant.’**‘‘Negative cosecant squared x,’ I murmured, feeling as light-headed and tingle-infested as I had when I'd received a perfect score.’*

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