$6-5.6^2$
$m^2+5m+4$
$\lim_{x\to0}\left(\frac{7+sin\left(x\right)}{x^2}\right)$
$4\:cos^3x-3\:cos\:x$
$y^2+50+336$
$\left(x^2+7\right)\left(x^2+3\right)$
$\lim_{x\to0}\left(\frac{\tan\left(nx\right)-n\tan\left(x\right)}{n\sin\left(x\right)-\sin\left(nx\right)}\right)$
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