$\frac{d}{dx}\left(yz=2\ln\left(x+z\right)\right)$
$\left(4m+5n-2g\right)^2$
$\lim_{x\to2.001}\left(\sqrt{\frac{2+x}{2-x}}\right)$
$\left(x+1+z\right)\left(x+1-z\right)$
$72x^2-x-1$
$\frac{27a^3b^2}{3ab^2}$
$sin\frac{x}{2}=-\frac{\sqrt{3}}{2}$
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