$\left(1+\tan^2\left(x\right)\right)\left(1-\tan^2\left(x\right)\right)$
$\tan^2x\sin x$
$x^3-11x^2x^2y^2+11y^2$
$\int\frac{x^3}{\left(x^3-64\right)}dx$
$\lim_{x\to0}\left(\frac{\sin^3\left(x\right)}{x^2}\right)$
$\left(a+x\right)\left(a-x\right)\left(a^2+ax+x^2\right)\left(a^2-ax-x^2\right)$
$\int\frac{4}{x^3-\:5x^2+7x-3}dx$
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