Question: How to substitute into an expression the values of two functions and also the values of their corresponding derivatives

relativistic_7.mwrelativistic_7.mwrelativistic_7.mw

I want to evaluate the function A(xi(t),eta(t),diff(xi(t),t),diff(eta(t),t)) atthe values of xi(t), eta(t), diff(xi(t),t),diff(eta(t),t)  given above.

Thank you

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