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How is this multiaxial relationship derived in this paper?

How did one arrive at the red-underlined part in the equation (2) from differentiating equation (1)? Please see the picture:

https://imgur.com/a/FZBUaY6

The paper referred here:

Chen, Y., Zhuang, W., Wang, S., Lin, J., Balint, D., & Shan, D. (2012). Investigation of FE model size definition for surface coating application. Chinese Journal of Mechanical Engineering, 25(5), 860-867.

https://link.springer.com/article/10.3901/CJME.2012.05.860

Comments

Solved. Simple chain rule.

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