arcsine

noun
arc·​sine | \ (ˌ)ärk-ˈsīn How to pronounce arcsine (audio) \
variants: or less commonly arc sine
plural arcsines also arc sines

Definition of arcsine

: the inverse function of the sine if y is the sine of θ, then θ is the arcsine of y abbreviation arcsin

First Known Use of arcsine

circa 1889, in the meaning defined above

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