Are the following functions quasiconcave, quasiconvex, both, or neither: f(x) = x³ - 2x f(x₁, x₂) = 6x₁9x2 f(x₁, x₂) x₂ - ln x₁ f(x, y) = (x + 1)² − (y + 2)² for x, y > - =

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