Need help with this syntax error that I can't identify. Made a program to determine A Right Triangle using Action Script 3.0 Adobe Animate CC

This is the coding I made.

// This line makes the button, btnDetermine wait for a mouse click

   // When the button is clicked, the determineIfRightTriangle function is called

   btnDetermine.addEventListener(MouseEvent.CLICK, determineIfRightTriangle);

   // These lines make the label, lblResponce wait for a mouse click

   // When these components are clicked, the clearLabels function is called

   lblResponce.addEventListener(MouseEvent.CLICK, clearLabels);

   // This is the determineIfRightTriangle function

   // e:MouseEvent is the click event experienced by the button

   // void indicates that the function does not return a value

function determineIfRightTriangle(e:MouseEvent):void

{

// declare the variables

var lengthofside1:int;

var lengthofside2:int;

var lengthofside3:int;

var responce:String;

// get the length of sides from the user for the right angle triangle

lengthofside1 = int(txtinLengthOfSide1.text);

lengthofside2 = int(txtinLengthOfSide2.text);

lengthofside3 = int(txtinLengthOfSide3.text);

// calculate whether the sum of both lengthofside1 and lengthofside2 each squared equals lengthofside3 squared (which must be the greatest value)

if (Math.pow(lengthofside1, 2) + Math.pow(lengthofside2, 2)= Math.pow(lengthofside3, 2)

{

lblResponce.text = "These sides will make a Right Triangle, because X^2 + Y^2 = Z^2.";

}

else

{

lblResponce.text = "These sides will NOT make a Right Triangle, because X^2 + Y^2 ≠ Z^2.";

}

}

// This is the clearLabels function

// e:MouseEvent is the click event experienced by the label

// void indicates that the function does not return a value

function clearLabels(e:MouseEvent):void

{

lblResponce.text = "";

}

This is the program that I made for the windows actions. Sorry it is blurry you can try to zoom in.