$\int\left(\frac{x\left(x^2-1\right)}{x^2+1}\right)dx$
$\int\frac{8x-3}{12x^2+7x+1}dx$
$\lim\:_{x\to\:\:0}\left(\frac{\sqrt{16-x^2}}{x-4}\right)$
$\left(6x^2+11x\right)x\left(6x^2+11x\right)$
$-2^2+3-2+3^2+-2+3+3$
$7m^2-49$
$25n^2-10nz+z^2$
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