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The inverse of the cosine function.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||arc cosine - the inverse function of the cosine; the angle that has a cosine equal to a given number|
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