Exp4j extras doesn't work

[Mirazez]

Required
I need some help to provide you correct solution.

1. Operation page on wiki has link to exp4j extras, but in reality these extras not exist. I tried to use "if(x,y,z)" but this don't work.

Disclaimer
I do NOT provide any solution about that.

• Using informal launcher such as Feather client
• Closed-source plugin/mod such as Optifine and ItemsAdder
• Usage in hybrid bukkit such as ArcLight