$cos\left(x+\frac{3\pi}{2}\right)=sinx$
$\frac{x^2-3x}{x+1}$
$\left(12\right)\left(-3\right)\cdot\left(4-5\cdot2\right)$
$21\left(\frac{2}{3}\right)$
$\left(2b^3-6b+4\right)\left(2b^2-3\right)$
$\int\:9re^{\frac{r}{2}}\:dr$
$\lim_{x\to2}\left(x^2-4\right)$
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