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d(xⁿ)/dx = nxⁿ⁻¹
(uv)' = u'v + uv'
(u/v)' = (u'v-uv')/v²
Dᵤf = ∇f · u
θ ← θ - η∇L
f'(x) ≈ [f(x+h)-f(x-h)]/(2h)