Diferenciales de funciones trigonométricas

$\textstyle \parbox{7cm}{
\begin{equation}\quad
d (\sin u) = \cos u du
\en...
...{equation}
\begin{equation}\quad
d (\tan u) = \sec^2 u du
\end{equation}}$ $\textstyle \parbox{7cm}{
\begin{equation}\quad
d (\cot u) = -\csc^2 u du
...
...ion}
\begin{equation}\quad
d (\csc u) = -\csc u \cot u du
\end{equation}}$

efrain 2009-07-20