$\lim_{x\to\infty}4x\:-\:1$
$21b+63b^2$
$\frac{2}{x^2-1}-\frac{1}{\left(x+1\right)^2}=\frac{1}{x-1}$
$\frac{dy}{dx}=y+2xe^x$
$-2x^2-5x+2$
$x\frac{dy}{dx}+3y=4x+6$
$-2-8-5-9+4+6+3+7-2$
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