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diff --git a/js/src/tests/ecma/Math/15.8.2.7.js b/js/src/tests/ecma/Math/15.8.2.7.js
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+/* -*- tab-width: 2; indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+
+/**
+ File Name: 15.8.2.7.js
+ ECMA Section: 15.8.2.7 cos( x )
+ Description: return an approximation to the cosine of the
+ argument. argument is expressed in radians
+ Author: christine@netscape.com
+ Date: 7 july 1997
+
+*/
+
+var SECTION = "15.8.2.7";
+var VERSION = "ECMA_1";
+startTest();
+var TITLE = "Math.cos(x)";
+
+writeHeaderToLog( SECTION + " "+ TITLE);
+
+new TestCase( SECTION,
+ "Math.cos.length",
+ 1,
+ Math.cos.length );
+
+new TestCase( SECTION,
+ "Math.cos()",
+ Number.NaN,
+ Math.cos() );
+
+new TestCase( SECTION,
+ "Math.cos(void 0)",
+ Number.NaN,
+ Math.cos(void 0) );
+
+new TestCase( SECTION,
+ "Math.cos(false)",
+ 1,
+ Math.cos(false) );
+
+new TestCase( SECTION,
+ "Math.cos(null)",
+ 1,
+ Math.cos(null) );
+
+new TestCase( SECTION,
+ "Math.cos('0')",
+ 1,
+ Math.cos('0') );
+
+new TestCase( SECTION,
+ "Math.cos('Infinity')",
+ Number.NaN,
+ Math.cos("Infinity") );
+
+new TestCase( SECTION,
+ "Math.cos('3.14159265359')",
+ -1,
+ Math.cos('3.14159265359') );
+
+new TestCase( SECTION,
+ "Math.cos(NaN)",
+ Number.NaN,
+ Math.cos(Number.NaN) );
+
+new TestCase( SECTION,
+ "Math.cos(0)",
+ 1,
+ Math.cos(0) );
+
+new TestCase( SECTION,
+ "Math.cos(-0)",
+ 1,
+ Math.cos(-0) );
+
+new TestCase( SECTION,
+ "Math.cos(Infinity)",
+ Number.NaN,
+ Math.cos(Number.POSITIVE_INFINITY) );
+
+new TestCase( SECTION,
+ "Math.cos(-Infinity)",
+ Number.NaN,
+ Math.cos(Number.NEGATIVE_INFINITY) );
+
+new TestCase( SECTION,
+ "Math.cos(0.7853981633974)",
+ 0.7071067811865,
+ Math.cos(0.7853981633974) );
+
+new TestCase( SECTION,
+ "Math.cos(1.570796326795)",
+ 0,
+ Math.cos(1.570796326795) );
+
+new TestCase( SECTION,
+ "Math.cos(2.356194490192)",
+ -0.7071067811865,
+ Math.cos(2.356194490192) );
+
+new TestCase( SECTION,
+ "Math.cos(3.14159265359)",
+ -1,
+ Math.cos(3.14159265359) );
+
+new TestCase( SECTION,
+ "Math.cos(3.926990816987)",
+ -0.7071067811865,
+ Math.cos(3.926990816987) );
+
+new TestCase( SECTION,
+ "Math.cos(4.712388980385)",
+ 0,
+ Math.cos(4.712388980385) );
+
+new TestCase( SECTION,
+ "Math.cos(5.497787143782)",
+ 0.7071067811865,
+ Math.cos(5.497787143782) );
+
+new TestCase( SECTION,
+ "Math.cos(Math.PI*2)",
+ 1,
+ Math.cos(Math.PI*2) );
+
+new TestCase( SECTION,
+ "Math.cos(Math.PI/4)",
+ Math.SQRT2/2,
+ Math.cos(Math.PI/4) );
+
+new TestCase( SECTION,
+ "Math.cos(Math.PI/2)",
+ 0,
+ Math.cos(Math.PI/2) );
+
+new TestCase( SECTION,
+ "Math.cos(3*Math.PI/4)",
+ -Math.SQRT2/2,
+ Math.cos(3*Math.PI/4) );
+
+new TestCase( SECTION,
+ "Math.cos(Math.PI)",
+ -1,
+ Math.cos(Math.PI) );
+
+new TestCase( SECTION,
+ "Math.cos(5*Math.PI/4)",
+ -Math.SQRT2/2,
+ Math.cos(5*Math.PI/4) );
+
+new TestCase( SECTION,
+ "Math.cos(3*Math.PI/2)",
+ 0,
+ Math.cos(3*Math.PI/2) );
+
+new TestCase( SECTION,
+ "Math.cos(7*Math.PI/4)",
+ Math.SQRT2/2,
+ Math.cos(7*Math.PI/4) );
+
+new TestCase( SECTION,
+ "Math.cos(Math.PI*2)",
+ 1,
+ Math.cos(2*Math.PI) );
+
+new TestCase( SECTION,
+ "Math.cos(-0.7853981633974)",
+ 0.7071067811865,
+ Math.cos(-0.7853981633974) );
+
+new TestCase( SECTION,
+ "Math.cos(-1.570796326795)",
+ 0,
+ Math.cos(-1.570796326795) );
+
+new TestCase( SECTION,
+ "Math.cos(-2.3561944901920)",
+ -.7071067811865,
+ Math.cos(2.3561944901920) );
+
+new TestCase( SECTION,
+ "Math.cos(-3.14159265359)",
+ -1,
+ Math.cos(3.14159265359) );
+
+new TestCase( SECTION,
+ "Math.cos(-3.926990816987)",
+ -0.7071067811865,
+ Math.cos(3.926990816987) );
+
+new TestCase( SECTION,
+ "Math.cos(-4.712388980385)",
+ 0,
+ Math.cos(4.712388980385) );
+
+new TestCase( SECTION,
+ "Math.cos(-5.497787143782)",
+ 0.7071067811865,
+ Math.cos(5.497787143782) );
+
+new TestCase( SECTION,
+ "Math.cos(-6.28318530718)",
+ 1,
+ Math.cos(6.28318530718) );
+
+new TestCase( SECTION,
+ "Math.cos(-Math.PI/4)",
+ Math.SQRT2/2,
+ Math.cos(-Math.PI/4) );
+
+new TestCase( SECTION,
+ "Math.cos(-Math.PI/2)",
+ 0,
+ Math.cos(-Math.PI/2) );
+
+new TestCase( SECTION,
+ "Math.cos(-3*Math.PI/4)",
+ -Math.SQRT2/2,
+ Math.cos(-3*Math.PI/4) );
+
+new TestCase( SECTION,
+ "Math.cos(-Math.PI)",
+ -1,
+ Math.cos(-Math.PI) );
+
+new TestCase( SECTION,
+ "Math.cos(-5*Math.PI/4)",
+ -Math.SQRT2/2,
+ Math.cos(-5*Math.PI/4) );
+
+new TestCase( SECTION,
+ "Math.cos(-3*Math.PI/2)",
+ 0,
+ Math.cos(-3*Math.PI/2) );
+
+new TestCase( SECTION,
+ "Math.cos(-7*Math.PI/4)",
+ Math.SQRT2/2,
+ Math.cos(-7*Math.PI/4) );
+
+new TestCase( SECTION,
+ "Math.cos(-Math.PI*2)",
+ 1,
+ Math.cos(-Math.PI*2) );
+
+test();