$\left(a-b\right)^2=27$
$\lim_{x\to\infty}\left(\frac{x-1}{x^2+1}\right)^{x+1}$
$x^2+xy-6xy+7xyz$
$\int x^8\left(1-x^6\right)^{-\frac{1}{2}}dx$
$\left(mn-n\right)\left(mn+n\right)$
$8+2\left(-3+-7\right)$
$-2x^2+4x+1$
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