arc cosine vs arccosine

arc cosine and arccosine both are nouns.

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

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

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

Other synonyms of arc cosine include arccos, inverse cosine.

arc cosine (noun)	arccosine (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