$\frac{x^{2}+4x+4}{x^{2}-1}:\frac{x+2}{x+1}$
$x^4=28$
$\int\left(\frac{\ln\:\left(x^2\right)\:}{x^3}\right)dx$
$\lim_{x\to-1}\left(\frac{\left(x+1\right)^3}{x^3+4x^2+5x+2}\right)$
$xy=c\left(x-1\right)\left(y-1\right)$
$67-96:\left(-12\right)+43-5.\left(-17\right)$
$\frac{n^2}{n}$
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