$\left(x+1\right)\left(x+3\right)+\left(x^2+7\right)$
$-x^3+x^2+12x$
$\frac{dy}{dx}\left(\sqrt{\frac{x^3-1}{x^2+4x}}\right)$
$\frac{x-1}{x+1}\ge7$
$\lim_{x\to0}\left(\arccos\left(\frac{\left(1+x^2\right)}{1+2x^2}\right)\right)$
$\left(6x^2\:-\:m^2x^2\right)\:\left(6x^2+\:m^2\right)$
$\lim_{x\to0}\left(\frac{cos\left(\frac{1}{x}\right)\left(cos\left(x\right)-1\right)}{x}\right)$
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