Sorry, my answer was not complete…If you use createxo, you could try this (avoiding the unbalanced brackets error)
\statement{
\(
\begin{cases}
\begin{array}{lclr}
f(x) & = & \sin(x) & (1) \\
h(x) & = & \sin(x) & (2) \\
i(x) & = & \sin(x) & (3) \\
j(x) & = & \sin(x) & (4) \\
k(x) & = & \sin(x) & (5)
\end{array}
\end{cases}
)
}
joke