...There are an infinite number of x 's for which sin x = y for any y in this interval, but if we restrict the domain of x to [-π/2, π/2], we can determine exactly one such x . In this case, we write x = Arcsin y or x = Sin -1 y , and this function y → x is called the inverse sine function. 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. ... *Some of the terminology explanations that mention the "inverse sine function" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…この区間に属する任意のyに対してsinx=yとなるxは無数にあるが,xの変域を[-π/2,π/2]に制限すると,このようなxはただ一つ定まる。このとき, x=Arcsiny,またはx=Sin-1yと書き,この関数y→xを逆正弦関数という。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。… ※「逆正弦関数」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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