co-function

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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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
Co-function is always a great word to know.
So is callithumpian. Does it mean:
a gadget; dingus; thingumbob.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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