$\left(x-4\right)\left(x+4\right)-\left(x+4\right)^2$
$9x+288$
$\left(2x\:-\:9\right)\:\left(2\:x\:+\:3\right)$
$\frac{m^9-n^9}{m+n}$
$\int\left(\frac{t}{\sqrt{t+4}}\right)dt$
$\left\{+3\:-6\:+9\:\right\}-\left(41-\left(9-16\right)\right)$
$36x^2-26x+4$
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