˜yÐÄvlog

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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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˜yÐÄvlog History and Origins

Origin of arc cosine1

First recorded in 1905–10

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