How can i specify in the otherwise condition of the following equation
\begin{cases}\ U & \text{if $A_{U_{Max}} = A_{U_{Min}} =$ Null},\\ \ \frac{A_{U_{Max}} - A_{U_{Min}}}{U\sqrt{2}} & \text{otherwise} \end{cases}
that if denominator is 0 then make it equal to 1 ?
