$a\sqrt[3]{a^{-2}}\cdot a^{\sqrt[3]{a^2}}$
$\left(-26\right)\left(47\right)$
$4cos2x+3cosx$
$\left(k-2\right)\left(k+2\right)$
$\frac{x^3-28x-48}{x+4}$
$4d^2-32d+256$
$-4x^4y^3-2x^3y^4+x^4y^3-7x^3y^4$
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