$16x^2-\frac{8x}{9}+\frac{1}{81}$
$\left(4a-3x\right)\left(4a-7x\right)$
$\frac{3x^4+2x^3-x^2-x-16}{x^2+1}$
$\sqrt{\left(x+1\right)\left(x-1\right)\left(x+2\right)x+\left|1\right|}$
$y=2x\:-\:\frac{x^3}{2}$
$18-\left(_{-9}\right)$
$\lim_{x\to0}\left(\frac{\sin\left(5x\right)}{\cos\left(2x\right)}\right)$
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