If you are using Angular v1.1.5 or later, you can also use ng-if:
<div ng-if="x" ng-include="'/partial.html'"></div>
If you have any older version:
Use ng-switch:
<div ng-switch on="x">
<div ng-switch-when="true" ng-include="'/partial.html'"></div>
</div>
Fiddle