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

tests/language/src/IntrinsifiedMethodsTest.dart

-// 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 program for testing the instanceof operation.
 
+
+testIsNegative() {
+  Expect.isFalse((12.0).isNegative());
+  Expect.isTrue((-12.0).isNegative());
+  Expect.isFalse((double.NAN).isNegative());
+  Expect.isFalse((0.0).isNegative());
+  Expect.isTrue((-0.0).isNegative());
+  Expect.isFalse((double.INFINITY).isNegative());
+  Expect.isTrue((double.NEGATIVE_INFINITY).isNegative());
+}
+
+testIsNaN() {
+  Expect.isFalse((1.0).isNaN());
+  Expect.isTrue((double.NAN).isNaN());
+}
+
+
+testTrigonometric() {
+  Expect.approxEquals(1.0, Math.sin(Math.PI / 2.0), 0.0001);
+  Expect.approxEquals(1.0, Math.cos(0), 0.0001);
+  Expect.approxEquals(1.0, Math.cos(0.0), 0.0001);
+}
+
 num foo(int n) {
   var x;
-  for(var i = 0; i <= n; ++i)
-    x = Math.sqrt(i);
+  for(var i = 0; i <= n; ++i) {
+    Expect.equals(2.0, Math.sqrt(4.0));
+    testIsNegative();
+    testIsNaN();
+    testTrigonometric();
+  }
   return x;
 }
 
 void main() {
-  var m = foo(40000);
+  var m = foo(4000);
 }