$\cot\left(x\right)\left(\sin\left(x\right)+\sin\left(2x\right)\right)$
$\frac{3x}{2x-8}$
$a-5=9$
$\lim\:_{x\to\:-1}\left(\frac{x^2-1}{x+\sqrt{2x+3}}\right)$
$a2-4$
$9x^2-81y^2$
$4x^2-8x-3=0$
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