Versed-sine meaning

A trigonometric function of an angle equal to one minus the cosine of that angle.
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(trigonometry) The number 1 minus the cosine of a given angle.
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(trigonometry) The trigonometric function 1 − cos(x).
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Origin of versed-sine

  • Translation of New Latin sinus versus sinus sine Latin versus past participle of vertere to turn

    From American Heritage Dictionary of the English Language, 5th Edition

  • From New Latin sinus versus (“flipped sine"); the sine function being sometimes called sinus rectus.

    From Wiktionary