cant move and rotate

ok this works , you need to subtract 90 from the angle. i dont know why exactly but it works.

I guess it maybe because it works out the angle from 1st quadrant in different ways.

img1.rotation=_angle-90;
           
     
            Ytrans=    (speedfire*Math.sin((_angle)*Math.PI/180));
            Xtrans=(speedfire*Math.cos((_angle)*Math.PI/180));

Here is an example how rotation in conjunction with speed changes movement. It is not pretty but just a concept:

var misslie:Sprite;
var sx:Number = 1;
var sy:Number = 1;
var speed:Number = 2;

init();

function init():void
{
     misslie = new Sprite();
     var g:Graphics = misslie.graphics;
     g.beginFill(0xFF0000);
     g.moveTo( -20, -6);
     g.lineTo(20, 0);
     g.lineTo( -20, 6);
     g.endFill();
     misslie.x = 200;
     misslie.y = 20;
     addChild(misslie);
     addEventListener(Event.ENTER_FRAME, move);
     sx = speed * Math.cos(0);
     sy = speed * Math.sin(0);
     var timer:Timer = new Timer(500);
     timer.addEventListener(TimerEvent.TIMER, changeAngle);
     timer.start();
}

function changeAngle(e:TimerEvent):void 
{
     misslie.rotation += 5;
     sx = speed * Math.cos(misslie.rotation * Math.PI / 180);
     sy = speed * Math.sin(misslie.rotation * Math.PI / 180);
}

function move(e:Event):void 
{
     misslie.x += sx;
     misslie.y += sy;
}