Fix error in sin-cos.js test introduced in r7129.

test/mjsunit/sin-cos.js

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Test Math.sin and Math.cos.
 
 function sinTest() {
   assertEquals(0, Math.sin(0));
   assertEquals(1, Math.sin(Math.PI / 2));
 }
 
 function cosTest() {
-  assertEquals(0, Math.cos(1));
+  assertEquals(1, Math.cos(0));
   assertEquals(-1, Math.cos(Math.PI));
 }
 
 sinTest();
 cosTest();
 
 // By accident, the slow case for sine and cosine were both sine at
 // some point.  This is a regression test for that issue.
 var x = Math.pow(2, 70);
 assertTrue(Math.sin(x) != Math.cos(x));
 
 // Ensure that sine and log are not the same.
 x = 0.5;
 assertTrue(Math.sin(x) != Math.log(x));