$\lim_{x\to2}\left(\frac{2-x}{\sqrt{4-4x+x^2}}\right)$
$\lim_{x\to\infty}\left(\frac{e^{-x^6}}{x^{-7}}\right)$
$7y^2-4+0y$
$14-5\cdot8$
$\lim\:_{t\to\:0}\left(\frac{\left(\left(6t^2-24t+36\right)\cdot\:e^t-12t\right)}{t^4}\right)$
$8ax-bx+8ay-by$
$\frac{4a^2b^7}{2a^5b^7}$
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