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Question: Re: Chain rule + how to refer to a previous result

Question:Re: Chain rule + how to refer to a previous result

pik1432 245 Maple 2019
syntax procedure differentiation operator
April 17 2020
1

This is a given set of equations (from a classifier problem in deep learning):

I tried to replicate the expression in Maple, but it was unsuccessful. 

Q_MaplePrime20200417.mw

Would you tell me how to make it work?

Then, please let me know how to refer to a previous result (equation number) in the current expression. 

The last line above (and the attached Maple document) shows my attempt, It did not work. 

Thank you/Be healthy!

 

 
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