$\displaystyle \oint _c \frac{x^{3y^3}}{\text{Your variable goes here}} d \bold{x}$
Seems okay. Any specific problems about LaTeX?
-Dan
I had trouble earlier today with a piecewise function. Using the example code:
f(x)=\begin{cases}
x^2 && x\ne0 \\
1 && x=0 \\
\end{cases}
I get:
$\displaystyle f(x)=\begin{cases}
x^2 && x\ne0 \\
1 && x=0 \\
\end{cases}
$
Other than that, I haven't experienced any problems.