恒等式
identity An equation that holds for all values of the variable in its domain, such as $f(-x) = -f(x)$ or $f(-x) = f(x)$ in the definitions of parity.
CSCA 数学 考试术语
identity An equation that holds for all values of the variable in its domain, such as $f(-x) = -f(x)$ or $f(-x) = f(x)$ in the definitions of parity.
CSCA 数学 考试术语