$3x^2+48xy+21y^2$
$\frac{1-\cos\beta}{\sin\beta}=\frac{\sin\beta}{1+\cos\beta}$
$\frac{2s+5}{\left(s+3\right)+25}$
$m^2n-m$
$x^2-2x-3=\left(x-3\right)\left(x+1\right)$
$4000\cdot\frac{3}{4}\cdot\frac{1}{5}$
$\int\frac{5x^2+8x+7}{x^3-x^2-15x-25}dx$
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