$-12+6-9-32+2+5$
$32a^2b-162b^5$
$\left(x-2\right)\left(x-3\right)=20$
$\left(15^2\right)^2$
$\lim_{x\to2}\left(\frac{x^2-8}{x-2}\right)$
$-4x+x-\left(-3\right)$
$\frac{\sec\left(x\right)\cos\left(x\right)}{\csc^2\left(x\right)}=\sin^2\left(x\right)$
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