$\left(2m+n\right)\left(2m-n\right)\left(4m^2+n^2\right)$
$4+4y$
$\frac{x^2-1}{x}$
$\frac{1}{\sec\infty-\tan\infty}=\sec\infty+\tan\infty$
$\int2x^2\left(x^3+7\right)^4dx$
$5ab^2+b^2$
$\int\frac{x-1}{\left(x+3\right)^2}dx$
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