$\lim_{x\to\infty}\left(x-\ln\left(x^2-1\right)\right)$
$5x^2y+4x-6y^3+3xy-2x^3+19+6x^2y-8xy^2$
$\frac{x^3+6x^2-7x+2}{3+x^2-2x}$
$2x-2<8$
$1-\sin^2$
$m^2+10m+20$
$\int12x\sqrt{-x^2+7}dx$
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