$25x^2+40x+64$
$x^2y+2y=5x$
$\frac{d}{dx}y^2=2x$
$4^2a^4b^2$
$4^2m-12n^2$
$\lim_{x\to\infty}3x^{-2}e^x$
$16+8n+n^2$
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