It's well-known that Spotlight now sports an integrated calculator. But I haven't seen anyone yet mention that it supports all of the standard C math(3) functions. For example, type sqrt(9), and you'll get an answer of 3. Type pow(2,2), and you'll get 4. You can type man math in Terminal to get a list of available math functions.
[robg adds: The Spotlight calculator also supports pi as a constant (and there may be others, but that's the only one I'm aware of).]
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