$xdx+\left(y-2\right)dy$
$-3a+4b-6a+81b-114ab+31a-a-b$
$\lim_{x\to1}\left(\frac{e^{2x}}{x^2}\right)$
$x^2=200+4y^2$
$x^3-2x^2-x$
$x^2-2x+8$
$25-10d+d^2$
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