$\lim_{x\to\infty}\left(\frac{x}{x^2+5}\right)$
$\left(b+\frac{1}{3}\right)^2$
$2x+3xy+x^3$
$sin^2x=-\frac{12}{13}$
$a:184\:c:513$
$7x^3y^2\:-3y^2\:x^3+\:9x^3y^2$
$12x^{24}y^4\sqrt{xy}$
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