51Թ

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arc cosine

noun

Trigonometry.

  1. the angle, measured in radians, that has a cosine equal to a given number. arc cos; cos −1

arc cosine

  1. The inverse of the cosine function.

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51Թ History and Origins

Origin of arc cosine1

First recorded in 1905–10

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arc cosecantarc cotangent

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