$\int\frac{-x-2}{x^2\left(x-1\right)^2}dx$
$\frac{x-13}{x}=5-\frac{10\left(5x+3\right)}{x^2}$
$\cos\left(x+y\right)=\cos\left(2x\right)$
$\frac{4a^2-9b^2}{2a+3b}$
$\lim_{x\to-1}4x^2$
$\frac{2b^2+6b}{2}$
$2-\left(-2\right)\left(-8\right)$
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