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cofunction

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co⋅func⋅tion

[koh-fuhngk-shuhn]
–noun Trigonometry.
the function of the complement of a given angle or arc: cosθ is the cofunction of sinθ.

Origin:
1905–10; co- + function
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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co·func·tion   (kō'fŭngk'shən)   
n.  The trigonometric function of the complement of an angle: The tangent is the cofunction of the cotangent.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Science Dictionary
cofunction   (kō'fŭngk'shən)  Pronunciation Key 
The trigonometric function of the complement of an angle. The tangent, for example, is the cofunction of the cotangent.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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