$-21.8-\left(-18.3\right)$
$\:+4\:-\:7\:-8\:$
$\frac{dy}{dx}\:=\:4\cos\left(x\right)\sin\left(y\right)$
$2x+2\sqrt{2x^{3}-x-2}$
$\int\frac{5x-4}{x^2-5x}dx$
$\left(a^2-b^3+c^4\right)^2$
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