$\frac{\sqrt{2-x}}{2-\sqrt{2+x}}$
$\log\left(x-8\right)-\log\left(2\right)=\log\left(8\right)$
$\lim_{x\to\infty}\sqrt{x^2+1}$
$2x-x+1$
$-50+65-1.600$
$\sqrt{2}x-\sqrt{3}x$
$-7x^2+4x^2$
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