$s2+2s+1=0$
$-12\left(8:\left(-4\right)\left(5-3\right)-2\left(-23+21\right)\right)$
$\int2xcot\left(3x^2\right)dx$
$13x\:-7\:>\:3x\:+8$
$\lim_{x\to\infty}\left(\frac{4x^7}{x^7-6}\right)$
$\frac{5x^2+15x}{x^2+6x+9}$
$\frac{1}{8}^3x\:-\:\frac{3}{4}^2x\:+\:\frac{3}{2}x\:-1$
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