$x^2-3x-28\ge0$
$8\sin\left(9x\right)\cos9x$
$x^3-36x$
$\left(x^2-12\right)\left(x^2-3\right)$
$\frac{dy}{dx}=e^{7x+8y}$
$\frac{-x^2-2x+1}{x+1}$
$\frac{mn}{z};\:m=-2;\:n=3\:;\:z=\frac{1}{2}\:$
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