$a^2-121b^2$
$3x+9=7x+1$
$x^6-x^5+x^4-x^3+x^2-x$
$\frac{7x^3-14x^2+21x-28}{x-1}$
$\frac{p^3\:x\:p^6}{p^2}x\frac{p^4}{p}$
$\lim_{x\to0}\left(\frac{\arcsin\left(x^2\right)}{x^2}\right)$
$\frac{4-a}{-1}$
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