$\left(x-n\right)\left(x^2\:+xn+n^2\right)$
$\frac{sec}{1+tan2}$
$3-4\cdot7+3$
$\int w\cos\left(8w\right)dw$
$\int\frac{x+3}{\left(x-2\right)\left(x^2+1\right)}dx$
$\frac{4x}{-4+x^2}=\frac{5}{x}$
$\left(x+a\right)\left(y+b\right)$
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