Changes

Line 1,231: Line 1,231:  
<math>\begin{matrix}
 
<math>\begin{matrix}
 
\operatorname{r}f
 
\operatorname{r}f
& = & \texttt{uv} \cdot \texttt{du~dv} & + & \texttt{u(v)} \cdot \texttt{du~dv} & + & \texttt{(u)v} \cdot \texttt{du~dv} & + & \texttt{(u)(v)} \cdot \texttt{du dv}
+
& = & \texttt{uv} \cdot \texttt{du~dv} & + & \texttt{u(v)} \cdot \texttt{du~dv} & + & \texttt{(u)v} \cdot \texttt{du~dv} & + & \texttt{(u)(v)} \cdot \texttt{du~dv}
 
\\ \\
 
\\ \\
 
& = & \texttt{du~dv}
 
& = & \texttt{du~dv}
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