AskDefine | Define cofunction

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Noun

  1. The trigonometric function of the complement of the supplied angle (thus cosine is the cofunction of sine)

Extensive Definition

In mathematics, a function f is cofunction of a function g if f(A) = g(B) whenever A and B are complementary angles. This definition typically applies to trigonometric functions.
For example, sine and cosine are cofunctions of each other (hence the "co" in "cosine"):
The same is true of secant and cosecant and of tangent and cotangent:
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