Wxx If I take the second derivative with respect to x and x so first I want to take maybe the derivative with respect to x Wx But first, let's take the first partial, Wx That will be 2ax by, right?

如果我要求二阶偏导数,首先要求关于x的一阶偏导数,让我们首先求出,它等于2ax+by，对吧？

youdao

In this paper, the formula of partial derivative of second order on compound function of many varables is established.

本文建立了多元复合函数的二阶偏导数公式。

youdao

For all samples, the raw spectra were pretreated as second derivative and Norris derivative filter(7,5). partial least square (PLS) was used as the calibration algorithm.

在所有的校正模型中，原始谱图经过二阶导数和偏最小二乘（ PLS）处理，20个外部样品用于所建模型的验证，实际和预测的平均相对偏差<5%。

youdao

So, using those, now, what happens if we take the second derivative of A, the mixed derivative, partial with respect to T and the partial with respect to V.

如果我取A的二阶导数,混合导数，对T偏微分,再对V偏微分。

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