$81^4-126^2+49$
$\frac{xdy}{dx+y}\:=\:e^x,y\left(1\right)=1$
$\int\frac{xy}{x^2+y^2}dx$
$\lim_{x\to x}\left(x^{\frac{1}{1-x}}\right)$
$y=x+5ln\left|x+1\right|+c$
$400+40b+b^2$
$2a\sqrt{3a}$
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