$21+9b-4b$
$\frac{d}{dx}\left(e^{2x+y}=x^2-5\right)$
$\lim_{x\to0}\left(cosx\right)^{x^{-4}}$
$-4\:+5\:+7\:-9\:+2$
$2^3-1000$
$\left(4-8a\right)^2$
$\int\frac{7x+1}{\left(x+3\left(x-1\right)\right)}dx$
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