$\frac{x^2-9}{2x-4}$
$-3219-\left(-2675\right)$
$-13=\frac{r}{9}+8$
$\frac{1}{2}\cos\left(5x\right)^4$
$\sin\left(x\right)\tan\left(x\right)+\sqrt{3}\sin x=0$
$\lim_{x\to\infty}\left(\frac{5x+7}{x^2-6}\right)$
$2\int te^{-3t}dt$
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