cofunction
co·func·tion
noun \ˈkō-ˌfəŋ(k)-shən\Definition of COFUNCTION
: a trigonometric function whose value for the complement of an angle is equal to the value of a given trigonometric function of the angle itself <the sine is the cofunction of the cosine>
First Known Use of COFUNCTION
1909
Rhymes with COFUNCTION
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