$cos^{\:3}x+cos\:x=0$
$5x^55x$
$\lim_{x\to-2}\left(\frac{-8+3x^2+2x}{x+2}\right)$
$2\frac{dy}{dx}+6y+4=0$
$\frac{\left(x-3\right)\left(x+3\right)\left(x+3\right)}{x+4}$
$\lim_{x\to1}\left(\frac{6}{x^{1-x}}\right)$
$\frac{\left(sec^2\left(x\right)-1\right)}{tan\left(x\right)}$
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