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arc cosine

noun

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.

Origin:
1905–10

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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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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Arc cosine is always a great word to know.

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a chattering or flighty, light-headed person.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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