$\lim_{x\to0}\left(\frac{2-2\cos\left(x\right)}{x^2}\right)$
$121-16z^4$
$\frac{2-x}{x}\le3$
$-6-2\left(n+9\right)$
$2x+15x-17x+8x$
$\frac{d}{dx}\sqrt{e^x+1}$
$2sin2x-4sinx=0$
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