$-5+\left(-10\right)-\left(-6\right)+\left(-2\right)$
$36x^{2}-108x^{4}+81$
$\frac{-14x^7-7x^5+21x^3}{7x^3}$
$\frac{sin^2}{tan^2}\:$
$\lim_{x\to\infty}\:\left[\sqrt{3x-2}-\sqrt{3x+4}\right]$
$2-3i^4$
$\lim_{x\to1}\left(\frac{\sqrt{x-1}}{x^3-1}\right)$
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