3角函数转化函数整理

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2007-09-27

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 http://wxsr.blogbus.com/logs/10047558.html

发表于 :2007-07-02 13:09

先发一不分//有空再补全~~
class Math2 {
var x_:Number;
var y_:Number;
var z_:Number;
function MAth2 (a, b) {
  var point = {x:a, y:b};
}
//角度弧度转换
function angle_radian (a, blo) {
  var new_val;
  blo ? new_val = a * 180 / Math.PI : new_val = a*Math.PI / 180;
  return new_val;
}
// 正弦（两角和差）
function sin_2 (a, b, blo) {
  var new_val;
  blo ? new_val = Math.sin (a) * Math.cos (b) + Math.cos (a) * Math.sin (b) : new_val = Math.sin (a) * Math.cos (b) - Math.cos (a) * Math.sin (b);
  return new_val;
}
// 正弦2倍角
function sin_ (a) {
  var new_val;
  new_val = a * Math.sin (a) * Math.cos (a);
  return new_val;
}
//正弦半角
function sin_h (a) {
  var new_val:Object = new Object ();
  var tmp;
  tmp = Math.abs ((1 + Math.cos (a)) / 2);
  new_val = {minus:tmp, positive:-tmp};
  return new_val;
}
//正弦平方
function sin_pow_ab (a, b) {
  var new_val;
  new_val = -.5 * (Math.cos (a + b) - Math.cos (a - b));
  return new_val;
}
// 余弦（两角和差）
function cos_2 (a, b, blo) {
  var new_val;
  blo ? new_val = Math.cos (a) * Math.sin (b) - Math.sin (a) * Math.cos (b) : new_val = Math.cos (a) * Math.sin (b) + Math.sin (a) * Math.cos (b);
  return new_val;
}
//余弦2倍角
function cos_ (a) {
  var new_val;
  new_val = Math.pow (Math.cos (a), 2) - Math.pow (Math.sin (a), 2);
  return new_val;
}
//余弦半角
function cos_h (a) {
  var new_val:Object = new Object ();
  var tmp;
  tmp = Math.abs ((1 - Math.cos (a)) / 2);
  new_val = {minus:tmp, positive:-tmp};
  return new_val;
}
//余弦平方
function cos_pow_ab (a, b) {
  var new_val;
  new_val = .5 * (Math.cos (a + b) + Math.cos (a - b));
  return new_val;
}
//正弦余弦成积
function sina_cosb (a, b) {
  var new_val;
  new_val = .5 * (Math.sin (a + b) - Math.sin (a - b));
  return new_val;
}
///////////////////////////////////////////////////////////
//正切两角和差
function tan_2 (a, b, blo) {
  var new_val;
  blo ? new_val = (Math.tan (a) + Math.tan (b)) / 1 - Math.tan (a) * Math.tan (b) : new_val = (Math.tan (a) - Math.tan (b)) / 1 + Math.tan (a) * Math.tan (b);
}
//正切2倍角
function tan_ (a) {
  var new_val;
  new_val = 2 * Math.tan (a) / (1 - Math.pow (Math.tan (a), 2));
  return new_val;
}
//正切半角
function tan_h (a) {
  var new_val:Object = new Object ();
  var tmp;
  tmp = Math.abs ((1 - Math.cos (a)) / (1 + Math.cos (a))) * Math.tan (a / 2);
  new_val = {minus:tmp, positive:-tmp};
  return new_val;
}
}