Incazelo yesichazamazwi yegama elithi "arc tangent" isho umsebenzi we-trigonometric ophambene onikeza i-engeli i-tangent yayo eyinombolo enikeziwe noma isilinganiso. Ichazwa ngokuthi "arctan" noma "tan^-1". I-engeli i-tangent yayo elingana nenombolo ethile, futhi ivezwa ngama-radians noma amadigri. Ekubhalweni kwezibalo, umsebenzi we-arc tangent uchazwa kanje: i-arctan(y) = x, lapho u-y eyi-tangent ye-engeli x.