$\lim_{x\to\infty}\left(\sqrt{81x^2+x}-9x\right)$
$x^4+2x^3-67x^2-8x^1+672$
$x^2m^3-m$
$\int t^3\cos\left(2t\right)dt$
$4x^2-\frac{4}{3}x^2+\frac{1}{3}$
$\left(a+b\right)^2\:-\:\left(a+b\right)\left(a-b\right)$
$\int\sin^4\left(2x+1\right)dx$
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