$\lim_{x\to5}\left(-\sqrt{2x+1}\right)$
$x^2-8x+7=0$
$\lim\:_{x\to+0}\left(x^{\left(\ln\:\left(x\right)\right)^2}\right)$
$-\int\frac{x^5}{x^4-1}dx$
$x\frac{dy}{dx}-y+\sqrt{x^2-y^2}$
$3x^2+5x\:-2=0$
$\frac{2\cdot\sqrt{2}}{\sqrt{2}\cdot\sqrt{2}}$
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