The integral of (2x+1)dx equals x² + x + C, but our forgetful calculus hero left out the +C! The constant of integration is like that one friend who shows up late to the party but is essential for mathematical completeness.
Missing the constant of integration is practically a rite of passage in calculus class. Your professor circles it in red pen, your classmates snicker, and somewhere a mathematician sheds a single tear. But hey, at least the derivative of both answers is the same, so you're technically correct... the best kind of correct!
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