$3m^4-48$
$cos2x\:cos5x$
$\lim_{x\to4}e^{\frac{x+2}{x-4}}$
$\int\frac{16}{x^2-4}dx$
$\frac{x+2}{x^2+4x+4}:\frac{x^2-4}{x^3+8}$
$\lim_{x\to\infty}\left(\frac{x^2+2x}{x-1}\right)^{\frac{1}{x}}$
$\frac{19}{2x-10}\le-5$
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