$\left(8\right)\left(-2\right)\left(-2\right)\left(1\right)$
$2x-5\cdot\:3x+7$
$x^2-x>12$
$\left(6x-3\right)\left(-6x-3\right)$
$cosx-cos^2x=\frac{cscx-cotx}{cotx+tanx}$
$\lim_{x\to\infty}\left(\sqrt{x^2+x-1}-\sqrt{x^2-2x}\right)$
$-2x^4+5x^3-x$
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