Question: Define variables for several equations only ONCE


I am new to the Maple Forum and have the following question.I am calculating some Gaussian error propagations and other equations and did this in this way:


Now I am having several dozens of different y and z for which I have to calculate the above equation. How can I define these variables y and z only once at the beginning before all equations and press the button !!! that everything afterwards is just calculated with the defined variables? This way I would only have to change the variables once instead of several times in each term and for each equation.

Thank you very much. I appreciate your help!


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