How to set a projectile's vector based on Bow Force and Yaw only

Had to devise this, cause the setYaw() method seems to do nothing. Here's this if any of you need to as well.
I put this in my ProjectileLaunchEvent.

Code:java

 
Float force = Force.get(shooter);
Float dirX = (float) ((0 - (Math.sin((shooter.getLocation().getYaw() / 180) * Math.PI) * 3)) * force);
Float dirZ = (float) ((Math.cos((shooter.getLocation().getYaw() / 180) * Math.PI) * 3) * force);
 
event.getEntity().setVelocity(event.getEntity().getVelocity().setX(dirX));                       
event.getEntity().setVelocity(event.getEntity().getVelocity().setZ(dirZ));
 

The hashmap "Force" stores the float from a bow's force in the EntityShootBowEvent, then repurposes it to define how large of a vector to create.