$\left(3x\right)\left(3y\right)$
$\lim_{x\to\infty}\left(\frac{x^2+19}{x^3+18}\right)$
$\tan^2x-\sin^2x=\tan^2x.\sin^2x$
$12x+7<\:-11\:\:$
$x=-2,m=3,a=2,2mx-2a$
$w\left(\sqrt{\frac{x}{x-8}}\right)$
$x^2+12x+2$
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