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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 unabridgedWords at Play
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The first known use of arcsine was circa 1889
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