$5f^3+4f^2+3f^2$
$\frac{1-\tan\left(a\right)}{1+\tan\left(a\right)}$
$-4w\left(w^2-9\right)$
$\left(yx^2+yx-x\right)\left(yx+x-yx^2\right)$
$9x^2-y^2+20=109$
$\lim_{x\to\infty}\left(1-\frac{3}{x}\right)$
$\frac{dy}{dx}\:sin^2\:\left(e^x\right)$
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