Even function
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For a function f ( x ) of x , if f ( -x ) = f ( x ), then the function is called an even function. For example, if f ( x ) = ax n , where n is an even number, then the function is an even function. f ( x ) = cos x is also an even function. It is also clear that an even function ± an even function = an even function. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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x の関数 f(x) について，f(－x)＝f(x) が成り立つとき，この関数を偶関数という。たとえば，f(x)＝axn において，n が偶数ならば，この関数は偶関数。 f(x)＝ cos x も偶関数である。また偶関数 ± 偶関数 ＝ 偶関数も明らかである。
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