逗号只能用于分隔函数的自变量。

A comma should only be used to separate function arguments.

youdao

这个函数的自变量出现表达错误。

The argument of the function was misrepresented.

youdao

确保表达式中所有函数的自变量数量正确。

Ensures that all functions in an expression have the correct number of arguments.

youdao

Change the independent variable, find the change in the function, take the ratio and that's the derivative.

改变自变量,算出函数的变量,计算比值,这就是求导

耶鲁公开课 - 基础物理课程节选