Just enter a mathematical expression into the Google search box, and it will happily calculate it for you! (As well as display search results, if any.)

Some examples:
1+1
17/42
e
pi
sqrt(-1)
(1+2*i)*(3+4*i)
e^i
e^(i*pi)+1

Some other examples:
answer to life the universe and everything
log(sqrt(answer to life the universe and everything + 7) + 1) / log(2)

Some useful conversion stuff:
one mile in km
two grams in pounds

It won't even try to calculate 5/0 :(

[quote author=iago link=board=2;threadid=2424;start=0#msg18959 date=1061684343]
It won't even try to calculate 5/0 :(
[/quote]
That makes sense... There are either 0 or infinite correct answers, depending on how you look at it :)

What about 1? "Invalid use of NULL"? :P

Cheater~

I still prefer Maple. ;)