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The eternal struggle of calculus students everywhere! That mysterious "dx" in integration formulas haunts us all. It's that moment when you're staring at ∫f(x)dx and thinking "I've been copying this symbol for three semesters and still have no idea what it actually means."
For the curious: dx is actually a "differential" representing an infinitesimally small change in x. It's basically math's way of saying "we're slicing this into pieces so tiny that they're practically dust, then adding them all up." But most of us just write it down and pray the professor doesn't ask us to explain it during the exam!
The real calculus trauma comes when they start throwing in dy/dx, ∂z/∂x, and other terrifying notation. Suddenly you're drowning in alphabet soup while your professor insists "it's quite intuitive actually."
