Use trinkets

/run UseInventoryItem(13);
/run UseInventoryItem(14);

Use trinket if no cooldown

/run if  GetInventoryItemCooldown("player", 13)==0 then UseInventoryItem(13)end 

Stops casting spell and use both trinket slots if no cooldown

/run if GetInventoryItemCooldown("player", 13) == 0 then UseInventoryItem(13); SpellStopCasting(); end
/run if GetInventoryItemCooldown("player", 14) == 0 then UseInventoryItem(14); SpellStopCasting(); end

Trinket if no cooldown, else Shadow Word: Pain

/run local s=GetInventoryItemCooldown("player", 13) if s~=0 then CastSpellByName("Shadow Word: Pain") else UseInventoryItem(13) end