Visual Basic. Using a loop to solve the cosine function.

[sanddrag]

I need to do this http://upload.wikimedia.org/math/5/b...69cad0c4a3.png in Visual Basic.

Attached is what I have done so far. I can't get it to work right though. I am not a programmer and I'm really struggling with this. I think the problem is coming from instead of (2*n)factorial my program is doing (n factorial)*2. I don't know how to fix it.

It should be noted that the "n" in that equation corresponds to "Counter" in my program and "n" in my program represents the number of terms of the series (since we can't have it going ifinitely).

Hopefully someone can help. Thanks.