cofunction

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

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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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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00:10
Cofunction is always a great word to know.
So is flibbertigibbet. Does it mean:
a chattering or flighty, light-headed person.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
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