$9\cdot\left(-54\right)$
$\left(x^4-x^3+2x^2-4x-8\right)\left(x^4+x^3-x^2+x-2\right)$
$y^4-y^3+y^2-y$
$x-2y=0$
$\left(\frac{3x^4y^{-1}}{2z^5}\right)^4$
$\frac{d}{dx}\sqrt{4-7x}$
$\int\:\frac{\sec^2x}{2\tan x}dx$
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