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sec−1

American  

  1. Symbol, Trigonometry. arc secant.

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Then, if the required divisions are longer than those of the pattern, the angle is cos−1 α, but, if shorter, the angle is sec−1 α.

From Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" by Various

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