$\sqrt{2a}+\sqrt{3b}$
$1-2cos^2x=\frac{tan^2-1}{tan^2+1}$
$x\:\lim_{x\to\:-3}\frac{\sqrt{4x+28}-4}{x+3}\:$
$\lim_{x\to-1}\left(\frac{x^2-1}{\sqrt{x^2+3}-2}\right)$
$\lim_{x\to\infty}\left(\frac{2x^2+1}{6+x-x^2}\right)$
$54=x+18$
$m^4-m^3-9m^2-11-4$
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