a² + b² = c²E = mc²∫ f(x) dxπ ≈ 3.14159sin²θ + cos²θ = 1P × R × T / 100nCr = n! / (r!(n-r)!)√2 ≈ 1.414log(ab) = log a + log b1 + 1 = 2∑ i = n(n+1)/2d/dx (xⁿ) = nxⁿ⁻¹S = ut + ½at²ax² + bx + c = 0P(A ∪ B) = P(A) + P(B) − P(A ∩ B)T = 2π√(l/g)Δ = b² − 4ac
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