/use 13
#showtooltip
/use 14
#showtooltip
OR
#showtooltip
/use [ nomodifier:SHIFT] 13
/use [ modifier:SHIFT] 14
These macros will allow you to have your use function trinkets out on your cast bars but they will automatically change to show and use whichever trinkets you have equipped without having to drag and drop the trinket every time. Good for if you use different trinkets for different situations or even just for pvp vs pve
Where as the first 2 macros I listed will need 2 separate buttons and macro spaces, the 3rd macro will put both trinkets on 1 button. It will normal display the first trinket and switch to the second upon holding down SHIFT