the function of the complement of a given angle or arc: cosθ is the cofunction of sinθ.
- cog in the wheel,
- cog railway,
- cogan-reese syndrome
Origin of cofunction
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.