JSTests/test262/test/built-ins/Math/acos/S15.8.2.2_A1.js - WebKit - Git at Google

 // Copyright 2009 the Sputnik authors.  All rights reserved.
 // This code is governed by the BSD license found in the LICENSE file.

 /*---
 info: If x is NaN, Math.acos(x) is NaN
 es5id: 15.8.2.2_A1
 description: Checking if Math.acos(NaN) is NaN
 ---*/

 assert.sameValue(Math.acos(NaN), NaN);
	// Copyright 2009 the Sputnik authors. All rights reserved.
	// This code is governed by the BSD license found in the LICENSE file.

	/*---
	info: If x is NaN, Math.acos(x) is NaN
	es5id: 15.8.2.2_A1
	description: Checking if Math.acos(NaN) is NaN
	---*/

	assert.sameValue(Math.acos(NaN), NaN);