arcctn (arc cotangent)
The inverse of the cotangent function. Also written arc-cotangent, actn, cot-1, cotan-1, or ctn-1. The value of the arcctn function of any argument is an angle in radians whose cotangent function equals the given argument, that is, y = cot-1x if and only if x = cot(y) for 0 < y < symbol PI.

Related Terms: cotangent (cot), inverse trigonometric functions

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