arc co sine

arc cosine

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

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