$12x+5y+13+8x-9y-9$
$\frac{x-3}{\sqrt{x\:}-\sqrt{3}}$
$\frac{3}{2-x}\le\frac{1}{x+4}$
$\frac{z}{\left(z+1\right)^2}$
$2a^{2}+4ab,sia=1=b=2$
$\frac{\cos\left(x\right)-\sin\left(x\right)+1}{\cos\left(x\right)+\sin\left(x\right)-1}-\csc\left(x\right)$
$y^3-y^2-y+1$
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