$\lim_{n\to\infty}\left(\frac{7n+5}{7n+4}\right)^{n+3}$
$\left(x-\frac{1}{2}\right)\left(x-5\right)$
$f\left(x\right)=\:2x^2-3x+1$
$\lim_{x\to-\infty}\left(x^2-1\right)$
$-x^2-8x-16$
$\frac{x}{4}^2+2xy+9y^2$
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