$\sin\left(x\right)\left(\sin\left(x\right)\tan\left(x\right)+\cos\left(x\right)\right)=\tan\left(x\right)$
$\int e^{ax}\cos\left(ax\right)dx$
$x\left(x+2\right)\le0$
$\frac{\:x^{20}\:-\:5x^6\:+\:9x^4+5}{x+1}$
$\frac{6x^4+4x^3-2x-4}{x+9}$
$\left(7-2x\right)\left(1-2x\right)$
$\lim_{x\to\infty}\left(e^{-\sqrt{x}}\right)$
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