$\left(\frac{1}{2}+3t\right)\left(\frac{1}{2}-3t\right)$
$\lim_{x\to\infty}\left(\frac{5x}{\sqrt{x^3+x}}\right)$
$64x\:2\:-\:121$
$-2x^2+8x+3$
$-10+1-9x+6-8xz+x$
$2x^2-17x-9$
$x^2\frac{dy}{dx}=\sec y$
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