arc cosine vs inverse cosine

arc cosine and inverse cosine both are nouns.

Word	Noun	Adjective	Verb	Adverb
arc cosine	Yes	No	No	No
inverse cosine	Yes	No	No	No

As nouns, arc cosine and inverse cosine are synonyms defined as:

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

Other synonyms of arc cosine include arccos, arccosine.

arc cosine (noun)	inverse cosine (noun)
the inverse function of the cosine; the angle that has a cosine equal to a given number	the inverse function of the cosine; the angle that has a cosine equal to a given number