inverse sine

noun Trigonometry. Unabridged

arc sine

noun Trigonometry.
the angle, measured in radians, that has a sine equal to a given number. Abbreviation: arc sin; Symbol: sin −1
Also called inverse sine.

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Science Dictionary
arc sine  
The inverse of the sine function.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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