$x^2\le9$
$-3x^2+5x+4$
$4^5.4^3$
$x^2-8x+x$
$\int\left(4\right)\left(\pi\right)dx$
$+20\:+30\:+50\:-10$
$\frac{dt}{dx}\left(x+2\right)=cos\left(2t\right)$
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