You need CAS software for this functionality. It is not available from Casio for this calculator but a limited functionality app can be installed. Please click this link to download CAS software.
http://www.jeuxcasio.com/prog/g85/CAS/CAS230408.zip
Extract .g1a or .g1m file in any folder of choice. Use FA-124 software to install it on your calculator. Refer to user manual or help menu of FA-124 if you are unsure.
As for the use of this add-in you need to learn to use it first. This page has all the info you need or scroll below.
Presentation of the CAS
I am not sure I understand what you want, but if I am guessing right, you need to calculate formulas for derivatives, where the name of some variable appears eg= d(x^2)/dx = 2 x.
Sorry, the calculator does not have a CAS, you cannot perform symbolic calculations regardless of the subject (derivatives, integrals, sums of series, factoring polynomials, expanding polynomial products, polynomial division, etc.)
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