arctangent vs arctan

arctangent and arctan both are nouns.

Word	Noun	Adjective	Verb	Adverb
arctangent	Yes	No	No	No
arctan	Yes	No	No	No

As nouns, arctangent and arctan are synonyms defined as:

arctangent and arctan: the inverse function of the tangent; the angle that has a tangent equal to a given number

Other synonyms of arctangent include arc tangent, inverse tangent.

arctangent (noun)	arctan (noun)
the inverse function of the tangent; the angle that has a tangent equal to a given number	the inverse function of the tangent; the angle that has a tangent equal to a given number