The left book represents actual calculus—thick, comprehensive, and full of complex integration rules. The right book? That's "calculus if" the integral of a product equaled the product of integrals. The equation shown (∫f(x)*g(x)dx = ∫f(x)dx * ∫g(x)dx) is hilariously wrong and would collapse most of mathematics if true. It's the mathematical equivalent of saying "what if gravity was optional?" The thin book perfectly captures how much simpler—and utterly broken—calculus would be if this mathematical crime were allowed. Every calculus student's forbidden dream!
Calculus If We Just Ignored The Rules

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