$-18+1$
$8\int dx$
$\frac{d^2y}{dx^2}\:y=x^4e^{2x}-cosx$
$\frac{dy}{dx}=4xe^{7y}$
$\frac{\tan\left(x\right)}{1+\sec\left(x\right)}-\frac{\tan\left(x\right)}{1-\sec\left(x\right)}$
$\frac{5.5-2}{9-2}$
$18\:\cdot\:\left(-3\:-\:\left[\:8\:\cdot\:\left(-3\right)\right]\right)$
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