Try to be a little bit more consistent with writing out "(t)"

chapters/functions.tex

@@ -1502,7 +1502,7 @@ \subsection{Using the Derivative Annotation}\label{using-the-derivative-annotati
 &= \udfrac{}{t}\text{\lstinline!f!}(x(t),\text{\lstinline!g!}(x(t)))\\
 &= \pdfrac{\text{\lstinline!f!}}{x} \udfrac{x}{t} + \pdfrac{\text{\lstinline!f!}}{y} \pdfrac{\text{\lstinline!g!}}{x} \udfrac{x}{t}\\
 &= \left(\pdfrac{\text{\lstinline!f!}}{x} + \pdfrac{\text{\lstinline!f!}}{y} \pdfrac{\text{\lstinline!g!}}{x} \right) \udfrac{x}{t}\\
-&= \text{\lstinline!h!}(x,y) \udfrac{x}{t}
+&= \text{\lstinline!h!}(x(t),y(t))) \udfrac{x}{t}
 \end{aligned}
 \end{equation*}
 \end{nonnormative}