first order derivative second order derivative partial derivative什么意思

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firstorderderivativesecondorderderivativepartialderivative什么意思firstorderderivativesecondorderderivat

first order derivative second order derivative partial derivative什么意思
first order derivative second order derivative partial derivative什么意思

first order derivative second order derivative partial derivative什么意思
一阶导数的二阶导数偏导数