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When I have an equation like (example)...

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...I can derived it and turn it into TeXForm afterwards (that is what I want). Therefore, I might want to additionaly display it as an equation - as described in the last lines. Thus, I have to use HoldForm since I do not want to evaluate but just want to display it. Here, the operation that I want to show in $\LaTeX$ is an derivation and implicite definition.

If I have more parameters then $(x,y,z)$ it might come in handy to use a list varlist to store my variables and then derive the function considering another variable during each iteration. Thus, I take varlist[[i]] as my argument for the derivation of $f$. Obviously, $i$ is my loop variable. The exact same derivative of $f$ - considering $x$ in this case - should be expressed through...

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But as you can see, the list's name and $i$ as an argument are kept and the list is not evaluated at position $i$ so that $x$ does not appear in my final TeXForm. How to evaluate my list correctly while HoldForm is active?

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    $\begingroup$ People here generally like users to post code as Mathematica code instead of just images or TeX, so they can copy-paste it. It makes it convenient for them and more likely you will get someone to help you. You may find this meta Q&A helpful $\endgroup$ Commented May 27, 2019 at 17:33

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Something like this should work:

With[{i = varlist[[1]]}, TeXForm[HoldForm[D[f[x, y, z], x] = i]] ]

With holds all of the functions, searches through them, and replaces them before evaluating anything, and can therefore bypass HoldForm.

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