cofunction

[koh-fuhngk-shuhn]

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. 2012.
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Cofunction is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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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