$36n^2m^2-1$
$y^2+y+30$
$\lim_{x\to1}\left(x^3-2x+5\right)$
$-t+2t=8$
$\frac{d^3y}{dx^3}-\frac{3d^2y}{dx^2}+\frac{3dy}{dx}-y=0$
$4x^6-49$
$\frac{-18}{9}$
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