$t^2-18t+81$
$\int\sqrt{-2-9s}ds$
$8sin2xcos2x$
$u^2-64$
$\lim_{x\to n}\left(\frac{\left(8x\right)}{\ln\:\left(n\right)+3n+7}\right)$
$16x^2-48x^2+36$
$\int x^2e^{-3x}dy$
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