- TeX source:
-
f(x)=\left\{\begin{array}{lll}
\text { formula } 1 & \text { if } x & \text { is in domain } 1 \\
\text { formula } 2 & \text { if } x & \text { is in domain } 2 \\
\text { formula } 3 & \text { if } x & \text { is in domain } 3
\end{array}\right.