$-4x^2-16x-36$
$\:\left(\:x^{a+1}\:-\:8\right)\left(\:x^{a+1}+\:9\right)$
$6x^2-\left\{3x^2-2\left[y-3\left(x^2-y\right)-\left(x^2+6y\right)\right]\right\}$
$20f^4-60f^3+45^2$
$\left(\frac{x}{y}\right)^4$
$\frac{3}{\left(x^2-x-20\right)}$
$x^2-8x-65<0$
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