$4x^2-4x-39$
$\left(2\sin\left(x\right)-4\right)\left(\tan\left(x\right)-1\right)$
$\frac{x-1}{5x^2+4x-9}$
$\frac{dx}{dy}=e^{y-2x}$
$\sqrt{-\frac{4}{5}}$
$4a+3a$
$2m^2+5m-3\:$
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