$\int\frac{u-1}{-u^2-2u-2}du$
$\frac{2}{x+1}=4-\frac{6}{x-1}$
$x^{2+40x+400}$
$x^2+5x-14=0$
$9m^3-36n^8$
$\frac{3x^3+x^2+3x+1}{x^2+1}$
$2^2+30ab+169b^2$
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