/cast Bestial Wrath
/use Bladefist's Breadth
Bestial Wrath is the Beast Master buff that vastly increases the Pet's damage output, and the Hunter's as well if you have the correct specs. The Bladefist's Breadth is a trinket that increases Attack Power by 200 for 15 seconds. Both of these in unison increase my damage significantly, so I use this macro when I have long battles with bosses, or if I get swarmed by mobs and I want to kill them quickly (such as when mining, so I don't lose the node).
My second trinket does not have a use, but has a random buff that has a chance to occur on critical hits. When I have all three of these going at the same time, my damage goes through the roof! For this reason I like to keep my Crit% as high as possible. Right now it is at 24.78%. Anyway, because the second trinket (Hourglass of the Unraveller) does not have a "use", I don't add it to this macro; otherwise I would.