$-\frac{2}{9}=\frac{y+5}{x+6}$
$\left(\cot^2x+1\right)\left(\sec^2x-1\right)$
$2x^2y-3xy^2+2x^2y-4x^2y+2xy2$
$\frac{1}{\sqrt{1+4x^2}}$
$x2+11x+7$
$\int\left(ze^{x^2}\right)dx$
$\left(2bc+5ab^2\right)^2$
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