$\frac{dy}{dx}=xy-x-2y-2$
$0.9\cdot11$
$128+-201+4$
$a=ln\left(\frac{b+x}{x}\right)$
$\int\frac{\sqrt{100-x^2}}{9x^2}dx$
$4\sqrt{-24}$
$x\:\ln\sqrt{x+1}$
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