$\lim_{x\to9}\left(\frac{x^2-81}{45-4x-x^2}\right)$
$\left(x^3-3rx-2r-x\right)^2$
$\frac{8\left(n+1\right)\left(2n+1\right)}{3n^2}$
$\int x\cdot\frac{1}{\sqrt{x+16}}dx$
$x\left(m+n\right)-x^2-xy+y\left(m+n\right)$
$\frac{3x^2-2x-8}{x^2+2}$
$y^2=64$
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