$4\left(9\right)^2+3\left(9\right)-3$
$\lim_{x\to16}\left(\frac{x}{\sqrt{x+9}-3}\right)$
$\left(x-2y-8\right)\left(x-2y+4\right)$
$x^3-y^4=5x$
$\left(a+6\right)\left(a-4\right)$
$a2+2ax2+x^4$
$2+8-2+3+3$
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