noun Trigonometry.
the function of the complement of a given angle or arc: cosθ is the cofunction of sinθ.

1905–10; co- + function Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
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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