$\lim_{x\to\infty}\frac{x}{3^x}^2$
$\left(2t-t\right)\left(t-2\right)$
$0.5^3\cdot0.5^5$
$x\:-\:7\:+\:.25x\:+\:14$
$x-4.x-4$
$8\tan\left(-x\right)\cos\left(x\right)$
$2x+7x+x$
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