$\lim_{x\to-2}\left(\frac{x+2}{x^2+2x+2}\right)$
$8x-5\ge67$
$\int\frac{x+1}{\left(x+2\right)\left(x-a\right)}dx$
$8-5^2+\left(-1\right)^7$
$\left(-52\right)\left(-1.35\right)$
$\left(xz-yw\right)\left(xz+yw\right)$
$\left(x^{\frac{3}{2}}-2x^{\frac{1}{3}}\right)\left(x^{\frac{1}{2}}+3x^{\frac{-1}{3}}\right)$
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