$\int_{-3}^4e^{-\left(2x-3\right)}dx$
$\frac{4x-8}{x+2}$
$-\left(\:+47\:\right)\:-\:\left(\:-57\:\right)$
$81y^2+90y+25$
$\frac{\cos\left(2a\right)}{\sin\left(a\right)}+\frac{\sin\left(2a\right)}{\cos\left(a\right)}$
$\frac{4x-4}{x-2}$
$2x+6=20$
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