偶函数
even function A function is even if $f(-x) = f(x)$ for all $x$ in its domain; its graph is symmetric about the $y$-axis.
CSCA 数学 考试术语
even function A function is even if $f(-x) = f(x)$ for all $x$ in its domain; its graph is symmetric about the $y$-axis.
CSCA 数学 考试术语