$\left(ax^2\:+\:by^2\right)^2$
$4a^2-b^2=0$
$2+24+2324$
$2x+8^2$
$\lim_{x\to-2}\left(\frac{2x+3}{\left(x^2+x-2\right)}\right)$
$\frac{d}{dx}\ln x+4x^3$
$-3^2-2+5$
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