arccosine

/ɑrkˈkoʊsaɪn/
noun
  1. The inverse function of the cosine; the angle whose cosine is a given number.
    • The arccosine of 0.5 is 60 degrees.
    • She used the arccosine function to find the angle of the ramp.
    • In programming, math.acos() returns the arccosine of a value.
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