$1x^2-9$
$a^2-b^2+x^2-y^2+2\left(ax-by\right)$
$x^3y-4xy$
$22.325625+41.626875+22.276875+11.9025+3.15375+0.75625+8.128125+5.175625+64.35375+18.275625$
$\lim_{n\to\infty}\:1^{2n+1}$
$tan^2x-\frac{1}{tan^2x}$
$\frac{d}{dx}\left(x^3+2xy+y^3=10\right)$
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