<!--  CALCULATION OF COMPLEX NUMBER MULTIPLICATION  -->
function mul()
{
	var a=document.x.a1.value;
	var b=document.x.b1.value;
	var c=document.x.a2.value;
	var d=document.x.b2.value;
	var m1=(a * c) - (b * d);
	var m2=(a * d) + (b * c);
	document.x.multiplication.value = " " + m1 + "   +   i*" + m2;
}


<!--  CALCULATION OF COMPLEX NUMBER DIVISION  -->
function div()
{
	var a=document.y.a1.value;
	var b=document.y.b1.value;
	var c=document.y.a2.value;
	var d=document.y.b2.value;
	var e=document.y.a2.value;
	var e1=(document.y.b2.value)*-1;
	var div1=(a*c)-(b*e1);
	var div2=(b*e)+(a*e1);
	var div3=(c*c)+(d*d);
	var d1=div1/div3;
	var d2=div2/div3;
	document.y.division.value = " " + d1 + "   +   i*" + d2;

}


<!--  CALCULATION OF COMPLEX NUMBER DIVISION  -->
function sq()
{
	var a=document.z.a1.value;
	var b=document.z.b1.value;
//r = sqrt (a^2 + b^2)
	var c=Math.sqrt(a*a + b*b);
	var d=Math.sqrt((c-a)/2);
	var e=b/(2*d);
	document.z.square1.value=" " + e + "   +  i* " + d;
	e=e*-1;
	d=d*-1;
	document.z.square2.value=" " + e + "   +  i* " + d;
}