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Question: Partial Derivative using diff()

Question:Partial Derivative using diff()

100Vultures 10 Maple 2020
syntax diff
April 12 2021
2

Hello everyone!

I'm not experienced user since I am new to maple, right now I am struggling with partial derivatives.

I want to derivative formula L over diff(x(t), t). Im using dot notation.

 

Variable diff(x(t), t) is hidden under the name predkosc_x but using this variable name instead of x(t) with a dot also is not working.

 

What am I doing wrong that I cant derivative over few varaibles?

 

 

 

 

Also when im trying it this way

I also fail
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