$-4+6-1-7+9$
$\lim_{x\to1}\left(\frac{sin\left(\pi x\right)}{\ln\left(4x^2-3\right)}\right)$
$100-8\cdot23+6$
$a^2+50a+255$
$grhg$
$\frac{d}{dx}\frac{-9x+4}{5x^2-8}$
$\left(7x^5+9y^6\right)^2$
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