Here is a site I found by accident and had to share as I found it to be outstanding. Ever needed help with a math problem you couldn't figure out this would have been a great tool to use. Does more then math!!! Like ever wanted to know how many day you been alive input your birthday

Today's Wolfram|Alpha is the first step in an ambitious, long-term project to make all systematic knowledge immediately computable by anyone. Enter your question or calculation and Wolfram|Alpha uses its built-in algorithms and a growing collection of data to compute the answer. Based on a new kind of knowledge-based computing... More about Wolfram|Alpha »
Will save your queries in a pdf format also. I did
0.002 + e^(i pi) + sum 1/2^n (n = 1 to infinity)
And it gave the right result to the problem.

Can check it out here Wolfram|Alpha