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cofunction

[koh-fuhngk-shuh n] /ˈkoʊˌfʌŋk ʃən/
noun, Trigonometry
1.
the function of the complement of a given angle or arc:
cosθ is the cofunction of sinθ.
Origin
1905-1910
1905-10; co- + function
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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co-function in Science
cofunction
  (kō'fŭngk'shən)   
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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