$\lim\:_{x\to\:-1}\frac{x^3-4x^2-11x-6}{13x^4+2x^3-2x^2}$
$\left(x^2-5y^3\right)^2$
$-\left(4-8\right)\cdot3+9$
$23+1+13$
$-6\sqrt{3}-4\sqrt{3}$
$\left(x-3\right)^2x+1$
$-7s^2+2s+3$
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