arc tangent vs arctangent

arc tangent and arctangent both are nouns.

Word	Noun	Adjective	Verb	Adverb
arc tangent	Yes	No	No	No
arctangent	Yes	No	No	No

As nouns, arc tangent and arctangent are synonyms defined as:

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

Other synonyms of arc tangent include arctan, inverse tangent.

arc tangent (noun)	arctangent (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