$-x^3-4x-4$
$8.69-15.2$
$sin\left(x\right)=-0.4$
$5\tan x-6=2$
$\frac{dy}{dx}=2e^{2x-y}$
$resolver\:\:3a^5+3a^3+3a$
$\int\sqrt{x^2-16\:}dx$
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