$\int_{-2}^{-1}\left(\frac{1}{x-1}\right)dx$
$a^2b^3-2ab^2+3a^2b^2$
$7^3-2^3$
$3a^2+12a-15$
$\int_0^{\infty\:}\left(\frac{1}{\left(1+x\right)^2}\right)dx$
$x^2-10x+22=0$
$25\cot^2\theta\:-16=0$
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