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Make sure you get the right edition; most of the cheaper versions are older textbooks. Usually you can get away with using an older version (most updates are just problem revisions and typo corrections), but make sure.
Incidentally, why sell your textbooks? I often find myself going back to them for reference in later classes, particularly with my topic-specific stuff like thermodynamics and calculus.
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If ignorance is bliss, you must be having an orgasm.
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