$\frac{x}{2}+1\le3$
$4\left(x-x^3\right)^3$
$27xy-81x+21y-63$
$\int_{-\frac{1}{2}}^1\left(\sqrt{1-x^2}\right)dx$
$30\:-\:\left(-2\right)\:x\:10\:+\:\left(-5\right)\:x\:\left(-2\right)$
$\lim_{x\to2}\left(x^3-2x^2-2\right)$
$\frac{\tan^2\left(x\right)+1}{1-\sin^2\left(x\right)}=\sec^4$
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