Differential

In calculus, the differential is a form of the derivative representing the concrete change in y with respect to a change in x.

\begin{tikzpicture}[domain=0:4,declare function = {f(\x) = \x*\x*0.2+1;}] \draw[->] (-0.2,0) -- (4.2,0) node[right] {$x$}; \draw[->] (0,-0.2) -- (0,4.2) node[above] {$y$}; \draw plot (\x,f(\x)); \end{tikzpicture} ParseError: No such environment: tikzpicture at position 7: \begin{̲t̲i̲k̲z̲p̲i̲c̲t̲u̲r̲e̲}̲[domain=0:4,dec…

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Notation

The differential is denoted by dy, a function of x and dx.