An arccosine is an angle whose cosine is a particular value. The arccosine is a trigonometric function. The arccosine is the functional inverse of the cosine. If adjacent/hypotenuse = cosine(θ) then cosine-1(hypotenuse/adjacent) = θ. Arccosine is written arccosin or cos-1.
Definition: y = cos-1 x if and only if x = cos y.
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