| 单词 | first derivative |
| 释义 | Word Frequency first derivative(fɜːst dɪˈrɪvətɪv) noun the change of a function,f(x), with respect to an infinitesimally small change in the independent variable, x; the limit of [f(a + Δ x)–f(a)] /Δ x, at x = a, as the increment, Δ x, tends to 0. Symbols: df(x)/dx, f′(x), Df(x) |
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