$u=ln\left(\sqrt{x^2+y^2}\right)$
$7cm3squars$
$\lim_{x\to3}\sqrt{\frac{x^3+3x+4}{x^3+1}}$
$\frac{x^4-2x^2+2x-35}{x+3}$
$0\stackrel{\circ}{\square}$
$x+3<-2$
$12z+9x+5z+3x$
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