SINCE 1828
arcsine
noun
arc·sine
| \ (ˌ)ärk-ˈsīn
\
\
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
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Merriam-Webster unabridged
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