$x^3-64^4$
$16x^2-2x$
$\left(5a^3+4b^2+9\right)\left(8\right)$
$\lim_{x\to1}\left(\frac{x^2+2x-3}{\sqrt{2-x^2}-x}\right)$
$\sin^2x-3\cos x\:=0$
$\frac{dy}{dx}=-4y-e^{-x}$
$\frac{a^2}{36}-\frac{x^2}{25}$
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