Intrinisifed more core library methods: isNaN, isNegative, cos, sin.

tests/language/src/Unary2Test.dart

Index: tests/language/src/Unary2Test.dart
===================================================================
--- tests/language/src/Unary2Test.dart	(revision 3859)
+++ tests/language/src/Unary2Test.dart	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 // Dart test for testing binary operations.
@@ -8,6 +8,7 @@
   static moo() { return +5; }
   static testMain() {
     Expect.equals(1, (UnaryTest.foo() + UnaryTest.moo()));
+    var x = +.5;  // Legal number, '+' is not a unary operator.
   }
 }