arc sine vs arcsin

arc sine and arcsin both are nouns.

Word	Noun	Adjective	Verb	Adverb
arc sine	Yes	No	No	No
arcsin	Yes	No	No	No

As nouns, arc sine and arcsin are synonyms defined as:

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

Other synonyms of arc sine include arcsine, inverse sine.

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