The arccotangent function returns an angle whose cotangent is a particular value. The arccotangent is a trigonometric function. The arccotangent is the functional inverse of the cotangent function. If adjacent/opposite = cot(θ) then cot-1(adjacent/opposite) = θ. Arccotangent is written arccot or cot-1.
Definition: y = cot-1 x if and only if x = cot y.
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