[数] 余函数
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数 三角余函数
史蒂夫·乔布斯复出记
[数]余函数
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:These equations are also known as the cofunction identities.