What does ARCTAN stand for?

MLA style: "ARCTAN." Acronym Finder . 2012. AcronymFinder.com 11 Feb. 2012 http://www.acronymfinder.com/Arcus-Tangent-(trigonometry)-(ARCTAN).html
Chicago style: Acronym Finder . S.v. "ARCTAN." Retrieved February 11 2012 from http://www.acronymfinder.com/Arcus-Tangent-(trigonometry)-(ARCTAN).html
APA style: ARCTAN. (n.d.) Acronym Finder. (2012). Retrieved February 11 2012 from http://www.acronymfinder.com/Arcus-Tangent-(trigonometry)-(ARCTAN).html

Arcus Tangent (trigonometry)

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African Regional Conference on Science and Technology Associate of the Royal College of Science and Technology (University of Strathclyde; Glasgow, Scotland, UK) American Red Cross at Stanford University (Palo Alto, CA) African Regional Centre for Technology Air Refueling Control Team Air Refueling Control Time Albanian Rehabilitation Centre for Trauma and Torture Victims Amphibian and Reptile Conservation Trust (UK) Army Radio Code Aptitude Test Associate of the Royal Conservatory of Toronto		Arctic Research of the Composition of the Troposphere from Aircraft and Satellites (NASA) Advanced Research Center Telecommunications Interface Console AIDS Research Consortium of the Twin Cities (Minnesota) Am Really Cold That Is Certain (Kids Next Door show) American Red Cross Tissue Services (tissue bank) Annual Review of CyberTherapy and Telemedicine (journal) Andy Richter Controls the Universe (TV Show) Acute Respiratory Care Unit Advanced RAID (Redundant Array of Independent Disks) Configuration Utility American to Russian Converter Unit

Samples in periodicals archive:

RR]-1/e) 7 Arcus Tangent QTc = QT + [alpha]{arctan(1) - arctan(RR)} 8 Hyperbolic Tangent QTc = QT - [alpha]{[e.