$\lim_{x\to\infty}\left(\frac{\left(x-1\right)}{sin\left(\pi x\right)}\right)$
$\lim_{x\to4}\left(\frac{\sqrt{x^2+9}-5}{\sqrt{x-5}-3}\right)$
$\:x^4\:-\:49$
$20+15-\left(-4\right)$
$\sqrt{144z^2}$
$\left(a\:+\:b\:+\:1\right)\cdot\left(a\:+\:b\:-\:10\right)$
$\frac{dy}{dx}=\frac{cos\:y\:tanx}{-tany}$
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