$\sqrt{5-4x}-\sqrt{2x+7}+2=0$
$\frac{2tanx}{1+tan^2x}$
$\lim_{x\to\pi}\left(\frac{1+\sin\left(x-\frac{3\pi}{2}\right)}{x-\pi}\right)$
$y^4+14y^2w^2+49w^4$
$1+\cos2\left(x\right)$
$\left(-25\right)\cdot\left(25\right)$
$\sqrt{3}-\sqrt{2}^2$
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