MathGraph32 is able to calculate the partial formal derivative function of a real function of two or three variables.
It is created via menu Calculus - New real calculus - Partial derivate function.
A dialog box appears displaying all available functions (except function derivative function of which is already defined).
Select the function, specify a name for the derivative and choose the variable of derivation.
To be noted : It is the result of a formal calculus but the formula of the derivative is not available to the user.
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