$\frac{144m^2-49n^2}{12m-7n}$
$\int_1^2\left(x-1\right)e^{2x}dx$
$9\tan^2x-9\tan^2x\sin^2x$
$\int\frac{\ln\left(t\right)}{9t^3}dt$
$\left(2x-2m^2\:n^2\:\right)^2$
$\lim_{x\to\infty}\:\frac{4\left(-2\right)^x}{\left(-2\right)^x+1}$
$\left(\csc x-\sin x\right)^2=9$
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