<!--
var existsWin1 = 0

function MM_openBrWindow(theURL,winName,features) { //v1.0
  win1=window.open(theURL,winName,features);
  win1.focus();
  existsWin1=1
}
function closeWin() {
  onerror=null
  if (existsWin1==1) {win1.close()}
}
var step=1
var step1=1
var endString="\\end{array}"
 
function makeArray(n) {
  this.length = n
  for (var i=1; i<=n; i++){
    this[i] = null;
  }
  return this
}
function writeEqn(n){
  if (step<n){
    string1=string1+strng[step]
    string0=string1+endString
    step++
  }
  if (step==n){
    document.forms[0].Continue.value="Done"
  }
}
function writeEqn1(n){
  if (step1<n){
    string11=string11+strng1[step1]
    string10=string11+endString
    step1++
  }
  if (step1==n){
    document.forms[1].Continue.value="Done"
  }
}
var strng = new makeArray(4)
var strng1 = new makeArray(4)
var string1="\\begin{array}{lcl}A'(x)\\,&=&\\frac{d}{dx}\\,\\left[2x\\sqrt{1-x^2}\\right]\\\\"
var string11="\\begin{array}{rcl}A'(x)\\,&=&\\,0\\\\"
strng[1]="&=&\\,2x\\cdot\\frac{d}{dx}\\sqrt{1-x^2}+\\,\\sqrt{1-x^2}\\cdot\\frac{d}{dx}\\,2x\\\\"
strng[2]="&=&\\,2x\\cdot\\left[\\frac{1}{2}\\frac{-2x}{\\sqrt{1-x^2}}\\right]+\\,\\sqrt{1-x^2}\\cdot 2\\\\"
strng[3]="&=&\\,\\frac{-2x^2}{\\sqrt{1-x^2}}+2 \\sqrt{1-x^2}\\\\"
strng[4]="&=&\\,\\frac{2(1-2x^2)}{\\sqrt{1-x^2}}\\\\"
var string0=string1+endString
strng1[1]="\\frac{2(1-2x^2)}{\\sqrt{1-x^2}}\\,&=&\\,0\\\\"
strng1[2]="1-2x^2\\,&=&\\,0\\\\"
strng1[3]="x^2\\,&=&\\,\\frac{1}{2}\\\\"
strng1[4]="x\\,&=&\\,\\frac{1}{\\sqrt{2}}\\\\"
var string10=string11+endString
//-->