correcting programming

I did this programming, but it's not compiling. The user would enter two values, the program calculated and drew

I have no experience with Action Script, I did based on two programs that I found on the internet

var vt: Number = 0;
var w: Number = 2;
var f: Number = 60;
var amplitude1: Number;
var inicial1: Number;
var rad:Number;
var cosseno:Number;
var cos: Number;
var direçãoX: Number;
var direçãoY: Number;
var cosWaveColor:uint = 0x00FF00;
amplitude.text="";
inicial.text="";
var i:uint;
for(i = 1; i < stage.stageWidth; i++)

btn_enter.addEventListener(MouseEvent.CLICK, onClickHandler);

function onClickHandler(e:MouseEvent): void {
    switch(e.target.name){
        case "enter";
            if(amplitude.text != "")(inicial.text !=""){
                inicial1= parseFloat(inicial.text);                
                cosseno= w * i + inicial1;
                cos Math.cos(cosseno);                              
                amplitude1= parseFloat(amplitude.text !="");
                vt = amplitude1 * cos;               
                direçãoX=vt;
                direçãoY=i;
               
                graphics.beginFill(cosWaveColor);
                graphics.drawRect(i, cosWavePosition + cosPosY, 2, 2);
               
            }
        break;
    }       
}