text: // Copyright 2014 Samsung Electronics Co., Ltd.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //     http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS IS" BASIS
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  var delta = 0.0001;
  var mod_m = 1.0 - delta;
  var mod_p = 1.0 + delta;
  
  assert (isNaN (Math.cos (NaN)));
  assert ((Math.cos (+0.0)) == 1.0);
  assert ((Math.cos (-0.0)) == 1.0);
  assert (isNaN (Math.cos (Infinity)));
  assert (isNaN (Math.cos (-Infinity)));
  
  assert (Math.cos (Math.PI) > -1.0 * mod_p);
  assert (Math.cos (Math.PI) < -1.0 * mod_m);
  
  assert (Math.cos (Math.PI / 2) > -delta);
  assert (Math.cos (Math.PI / 2) < +delta);
  assert (Math.cos (-Math.PI / 2) > -delta);
  assert (Math.cos (-Math.PI / 2) < +delta);
  
  assert (Math.cos (Math.PI / 4) > mod_m * Math.SQRT2 / 2);
  assert (Math.cos (Math.PI / 4) < mod_p * Math.SQRT2 / 2);
  
  assert (Math.cos (-Math.PI / 4) > mod_m * Math.SQRT2 / 2);
  assert (Math.cos (-Math.PI / 4) < mod_p * Math.SQRT2 / 2);
  
  assert (isNaN (Math.sin (NaN)));
  assert (1.0 / Math.sin (0.0) == Infinity);
  assert (1.0 / Math.sin (-0.0) == -Infinity);
  assert (isNaN (Math.sin (Infinity)));
  assert (isNaN (Math.sin (-Infinity)));
  
  assert (Math.sin (Math.PI) > -delta);
  assert (Math.sin (Math.PI) < +delta);
  
  assert (Math.sin (Math.PI / 2) > 1.0 * mod_m);
  assert (Math.sin (Math.PI / 2) < 1.0 * mod_p);
  
  assert (Math.sin (-Math.PI / 2) > -1.0 * mod_p);
  assert (Math.sin (-Math.PI / 2) < -1.0 * mod_m);
  
  assert (Math.sin (Math.PI / 4) > mod_m * Math.SQRT2 / 2);
  assert (Math.sin (Math.PI / 4) < mod_p * Math.SQRT2 / 2);
  
  assert (Math.sin (-Math.PI / 4) > -mod_p * Math.SQRT2 / 2);
  assert (Math.sin (-Math.PI / 4) < -mod_m * Math.SQRT2 / 2);
  
  var step = 0.01;
  
  for (var x = -2 * Math.PI; x <= 2 * Math.PI; x += step)
  {
    var s = Math.sin (x);
    var c = Math.cos (x);
    var sqr_s = s * s;
    var sqr_c = c * c;
  
    assert (sqr_s + sqr_c > mod_m);
    assert (sqr_s + sqr_c < mod_p);
  }
  