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f'(x) = lim[h→0]

∫₀^π sin(x) dx = 2

PV = nRT

ΔG = ΔH − TΔS

E = mc²

χ² = Σ(O−E)²/E

∑_{n=1}^∞ 1/n²

H⁺ + OH⁻ → H₂O

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