$\frac{a^2-2a-3}{a^2-9a+18}$
$49x^2-196x+196$
$y'\:=\:xy\:+\:2x$
$\left(2x+2\right)\left(2x-5\right)$
$\tan\left(x\right)-\frac{3}{\tan\left(x\right)}=0$
$\frac{1-\cos\left(x\right)^2}{\sin\left(x\right)^2}=\tan\left(x\right)$
$\left(21x-14y+x\right)$
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