$\lim_{x\to\infty}\left(1+\frac{12}{x}\right)^{\frac{x}{6}}$
$\frac{1}{4-4x^2+x^4}$
$\frac{x^2+3x-6}{x^2-2x-8}$
$2x^{-x}$
$5-0.3t<2.1+0.5\left(t+1\right)$
$w^2-14w+49$
$x^2-13x+676$
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