X_L = U_m / T_m = ωL2π · fLf(x + Δx) − f(x)log₁₀ xsec² απR²sin² x + cos² x = 1e^iy = cos y + i·sin y∫ f(x) dxlim_{n→∞} 1/n = 0Δx → 0∇·E = ρ/ε₀a² + b² = c²F = maE = mc²∂y/∂xcos²θa = b ⇒ a = clg² 2 + 1 = sec² α∂y/∂x = lim Δ→0φ = (1 + √5)/2tg(α) = sin/cos∑ 1/n²iℏ ∂ψ/∂td/dx (xⁿ) = n·xⁿ⁻¹∇²φ = 0