If you want to write a script on how to find the cosine of an angle, this *isn't* your book. This is specifically geared to system administrators to make our lives significantly easier.
If you don't know anything about scripting, this is a great resource to get you started. It starts with the basics of VBScript, adds in things like WMI and WSH, and brings it all together for you to get work done.
If you already know scripting, this is a great reference book.
The most horrible thing is that there are an unacceptable number of typos in this book. Of course, if you are reading this, it's fairly easy to see these errors because the code and description don't make sense together...