$\lim_{x\to-\infty}\left(x^{-3}e^x\right)$
$\frac{-9x^2+x^4+x-3}{x+3}$
$\frac{5}{3}x+\frac{4}{9}x$
$4x^2-76x-361$
$\frac{1}{\sec\:\left(\theta\:\right)-\tan\:\left(\theta\:\right)}-\frac{1}{\sec\:\left(\theta\:\right)-\tan\:\left(\theta\:\right)}$
$\left(\frac{1}{2}a^5-3bc^2\right)^2$
$-3x^2+3x$
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