$\frac{2\tan x}{1+\tan^2x}=\sin x$
$\frac{d}{dx}\left(xz+y\sec\:\left(x\right)=z^2\right)$
$\frac{y}{8}+10+16$
$\int6xe^{\frac{x}{7}}dx$
$\frac{2x^2+11x-5}{x+5}$
$3a^3-5a+2a^2-4\:\:\:\:a^2+a^3-\:2a+1$
$\left(x+a\right)\left(x-2\right)$
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