…In other words, x = Arcsin y is the inverse function of the sine function y = sin x , whose domain is -π/2≦ x ≦π/2. Similarly, the inverse function of the cosine function y = cos x , whose domain is 0≦ x ≦π, is written as x = Arccos y or x = Cos -1 y and is called the inverse cosine function. Also, the inverse function of the tangent function y = tan x , whose domain is -π/2< x < π/2, is called the arc tangent function and is written as x = Arctan y or x = Tan -1 y , and the inverse function of the cotangent function y = cot x , whose domain is 0< x <π, is called the arc cotangent function and is written as x = Arccot y or x = Cot -1 y . … *Some of the terminology explanations that mention the "inverse cosine function" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…すなわちx=Arcsinyは,-π/2≦x≦π/2を定義域とする正弦関数y=sinxの逆関数である。同様にして,0≦x≦πを定義域とする余弦関数y=cosxの逆関数を, x=Arccosy,またはx=Cos-1yと書き逆余弦関数という。また,-π/2<x<π/2を定義域とする正接関数y=tanxの逆関数を,逆正接関数と呼んで, x=Arctany,またはx=Tan-1yと書き,0<x<πを定義域とする余接関数y=cotxの逆関数を,逆余接関数と呼んで, x=Arccoty,またはx=Cot-1yと書く。… ※「逆余弦関数」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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