$f\left(x\right)=x^4-4x^2$
$5\sqrt{x}^2$
$y^2+4\ge0$
$\left(z^2+8\right)^3$
$3x^{\frac{3}{2}}-9x^{\frac{-1}{2}}+6x^{\frac{-1}{2}}$
$\frac{x^2-6x+8}{x-2}$
$4.5-2.7$
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