arccosine

noun arc·co·sine \ (ˌ)är(k)-ˈkō-ˌsīn \

Definition of arccosine

: the inverse function of the cosine
  • if y is the cosine of θ, then θ is the arccosine of y
abbreviation arccos

First Known Use of arccosine

circa 1884

in the meaning defined above

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