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I wouldn't assume that — a Cocoa application process is an insane amount of overhead for a simple arithmetic expression evaluator, so who'd bother using it? Assuming Spotlight uses the same underlying evaluator, it's a safe bet that it's implemented as a library shared between the Spotlight search UI and the app. To be even more specific, on 10.8 at least, both Calculator.app and Search.bundle link to a private framework called Calculate, which may be relevant.

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