Javed,
Yes, Java does define asin, acos and atan methods in its Math class.
When you have a question about one of the Java classes, you will probably get a more complete answer from Sun's online documentation than from any book.
Here is a link to the Math class documentation:
http://java.sun.com/products/jdk/1.2/docs/api/index.html Hope it helps.
Also, please be sure to register your account with a proper id. It must be of the form "first name, space, last name". "A", unfortunately, does not count as a last name. Here is a page with further information:
http://www.javaranch.com/name.html It is great to have you participating at the ranch. I would hate to see your account get locked out because of this problem.
Thanks.
Stephanie